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Speeding Vehicles in Residential Areas. A Curriculum Developed by Rana Sampson Companion training curriculum to the Speeding in Residential Areas Problem-Oriented Policing Guide developed by Michael S. Scott. Speeding Problems in Residential Areas.

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speeding vehicles in residential areas

Speeding Vehicles in Residential Areas

A Curriculum

Developed by Rana Sampson

Companion training curriculum to the Speeding in Residential Areas Problem-Oriented Policing Guide developed by Michael S. Scott

speeding problems in residential areas
Speeding Problems in Residential Areas

This project was supported by Cooperative Agreement #2001CKWXK051 by the U.S. Department of Justice Office of Community Oriented Policing Services. Points of view or opinions contained in this document are those of the presenter and do not necessarily represent the official position or policies of the U.S. Department of Justice.

  • In communities across the country, one of the most common community complaints is of speeding vehicles in residential areas, even in areas where crime problems appear more serious.
how does it increase the risk of crashes and injuries
How Does it Increase the Risk of Crashes and Injuries?
  • The driver is more likely to lose control of the vehicle
  • The vehicle safety equipment is less effective at higher speeds
  • The distance it takes to stop the vehicle is greater
  • The vehicle travels farther during the time it takes the driver to react to the hazard
  • Crashes are more severe at higher speeds
speeding force of impact
Speeding – Force of Impact
  • Even modestly higher speeds can mean the difference between life and death for a pedestrian hit by a vehicle
  • The force of impact on the body is more than one-third greater at 35 mph than at 30 mph
  • Each 1-mph reduction in average speed translates roughly to a 5% reduction in vehicle crashes
speeders and crashes
Speeders and Crashes
  • Speeders are disproportionately involved in vehicle crashes
  • Speeding is a contributing factor in
    • 1/8 of all crashes, and
    • 1/3 of all fatal crashes
where do most crashes occur
Where Do Most Crashes Occur?
  • Rural
  • Suburban
  • Urban
  • Why?
what contributes to speeding
What contributes to speeding?
  • Popular culture?
  • Road design?
  • Driver beliefs?
  • Societal views of accidents?
why do drivers speed
Why Do Drivers Speed?
  • Many drivers admit to speeding.
  • What do drivers tell you about why they speed?
drivers perceptions
Drivers’ Perceptions
  • The most important factors in a driver’s choice to speed is the driver’s perception of the road environment and the speed that he or she thinks it is safe to drive
  • Drivers make calculated decisions to speed, creating opportunities for police to alter their calculations

Given that speeding is such a common community complaint, does the current police response to it reflect how serious it is to community members?

  • In your community, do citizens know how to report speeding problems? Whom to call, whom to speak to?
  • What kind of response do community members get when they call about speeding vehicles on their street?
  • Do the most common responses work? If so, for how long?
what training do officers receive in addressing speeding problems
What training do officers receive in addressing speeding problems?
  • ______________
  • ______________
  • ______________
  • What more would be useful?
  • ______________________
  • ______________________
generally there are four strategies used to address speeding
Generally, There Are Four Strategies Used To Address Speeding
  • Education
  • Enforcement
  • Regulatory
  • Engineering
the 85 th percentile
The 85th Percentile
  • The common standard for a posted speed limit is the 85th percentile. It is the speed on a specific street at or below which 85 percent of vehicles travel.
  • Motorists adjust their speeds for what is reasonable on a street, so the 85th percentile sets the speed to that traveled by most motorists.
  • The 85th percentile legalizes the vast majority of motorists driving.
  • Lowering speed limits below the 85th percentile does not significantly affect speeds or accidents.
how do jurisdictions determine the 85 th percentile
How Do Jurisdictions Determine the 85th Percentile?
  • Some don’t, they may set some streets at artificially low speed limits, often because of community pressure
there are different types of residential streets
There are Different Types of Residential Streets
  • A Local Street – A street whose primary function is access to adjacent properties – these residential streets are often posted 25 mph
  • A Collector Street – A street for which vehicle movement and access are of equal importance – these residential streets may be posted 35 mph
  • An Arterial Street – A major street for which the primary function is to provide vehicle movement

What We Know

  • Education
  • Enforcement
  • Regulation
  • Engineering
  • Neighborhood Safety Campaigns
    • Community Letters
    • Warnings
    • Community Meetings
    • Radar Speed Display Trailers
    • Neighborhood Speed Watch
    • Neighborhood Signage

A sample community

letter – its intent is to

gain the public’s

voluntary compliance

in reducing

residential speeding

neighborhood safety campaigns
Neighborhood Safety Campaigns
  • It is the least coercive means of trying to gain compliance with neighborhood speed limits
  • However, there is little empirical evidence to support that compliance is gained beyond a short period of time
  • If highly targeted, it can have some impact
highly targeted neighborhood safety campaign raleigh nc
Highly Targeted Neighborhood Safety Campaign – Raleigh, NC
  • Examined prior year’s citations at The Drive -- they had issued 300 speeding tickets in this one 25 mph school zone
  • The average speed of citations was 38 mph
  • 11% were for speeds exceeding 45 mph
  • The Police surveyed speeders and found that most were parents of school-aged children
  • Erected temporary speed signs to flash vehicle speeds
  • Placed speeding info in PTA newsletter
  • Distributed educational flyers to students’ parents
measuring effectiveness raleigh
Measuring Effectiveness - Raleigh
  • Campaign resulted in immediate reduction in speeding -- average speeds fell to 31 mph from 38 mph
  • The proportion of drivers complying with the speed limit (including a 5 mph tolerance) more than doubled after the educational effort, although by the end of the first week some of the impact deteriorated
  • Three weeks after the educational campaign there remained about a 50% increase in compliance from the compliance rate calculated during the analysis phase of the project
radar speed display trailers
May slow speeds during the time the display is in place (mixed results). On low volume streets, repeated use of the trailer may reduce speeds on the street by about 5% for as long as 30 days afterRadar Speed Display Trailers

Photo Credit: Tony Mazzela

Traffic Calming: State of the Practice

neighborhood speed watch
Neighborhood Speed Watch
  • Residents borrow radar guns from police, check speeds and write down the make, model and license plates of speeders
  • Police send warning letters to these speeders reminding them of the speed limit and reasons to reduce their speed


  • Near negligible effect
  • More a “resident calming” approach as residents tend to feel better after they do it
neighborhood yard signs
Neighborhood Yard Signs
  • Anti-speeding campaigns developed at the grass-roots level are potentially more effective than official campaigns.
  • Neighborhood yard signs, with different “slow down” anti-speeding messages can convey more heartfelt messages to speeders.

Slow Down!

Protect our Kids

Brought to you by your neighbors

For more information call …

Slow Down

For our Children

Brought to you by the Kensington neighborhood

For more information call …

play video segment
Play video segment
  • Neighborhood Safety Campaign

video segment

informing complainants about actual speeds
Informing Complainants About Actual Speeds
  • Complainants often inaccurately estimate speeds
  • Speeds seem faster to a stationary pedestrian watching from a front yard
  • What’s the best way to deal with this?
play video segment29
Play video segment
  • Busy Residential Street

video segment

simply lowering speed limits
Simply Lowering Speed Limits
  • Some residents ask the police to lower the posted speed on their street
  • Lowering speed limits has the general effect of reducing speeds by one-quarter of the speed limit reduction
  • Reducing the posted speed limit from 25 mph to 20 mph will reduce average speeds by about 1 mph

What Do We Know About How Well Enforcement Works?

  • Education
  • Enforcement
  • Regulation
  • Engineering
  • It can have impact during enforcement
  • Speeds revert to previous levels soon after enforcement
  • Residential streets are more amenable to traffic calming (discussed later in this presentation)
enforcement alerting the public
Enforcement – Alerting the Public?

Discuss the pros and cons of each approach

  • Some police agencies alert the community
  • Some police agencies specifically name the streets they’ll be ticketing
  • Some agencies simply say it will be in a certain general area
  • Some agencies explain why they will be enforcing at certain locations (e.g., high number of crashes, high level of community complaints)
  • Some agencies do these alerts on the morning radio
speed enforcement has the greatest effect
Speed Enforcement Has the Greatest Effect …
  • If drivers believe it is likely to occur, and
  • It is meaningfully costly to offenders, and
  • Enforcement is associated with driving in general, rather than any specific time of day or roadways,and
  • If enforcement is not associated with any specific cues that signal the presence or absence of enforcement efforts.
is there an incentive system for traffic officers
Is There An Incentive System for Traffic Officers?
  • How are they evaluated in your jurisdiction?
  • What if their goal was to maintain reduced average speeds in a specific geographic area of responsibility, what would change?
what do we know about photo radar speed enforcement
What Do We Know About Photo Radar Speed Enforcement?

Method: Radar gun with camera attached. Camera catches the speeding vehicle and the vehicle’s license plate and vehicle owner is sent a ticket

  • Some states allow this, others do not
  • Can be expensive, may be about $4,000 a month to lease equipment but is effective in reducing speeds and collisions
  • Research says that it is best used on high volume streets with collision problems

What Do We Know About Regulation?

  • Education
  • Enforcement
  • Regulation
  • Engineering
what about regulatory measures to reduce speeding do they work
What About Regulatory Measures to Reduce Speeding, Do They Work?
  • Common Regulatory Measures
    • Stop Signs
    • Speed Limit Signs
    • Turn Limits
    • One-Way Streets
what do we know about stop signs
What Do We Know About Stop Signs?
  • The consensus among traffic engineers is that stop signs should not be used as speed control measures
  • Research shows that on a stop-signed block, motorist do not slow to the speed limit at mid-block and they often do a rolling stop once they come to the stop sign
  • Research also shows that some drivers even speed up between stop signs to make up for lost time at the stop sign
play video segment40
Play video segment
  • Moraga Avenue

video segment

speed limit signs
Speed Limit Signs
  • Speed limit signs should reflect the 85 percentile to be effective.
  • Painting speed limits or “SLOW” on the road surface, in combination with posting roadside signs, can help reduce speeds.
  • And remember, lowering speed limits below the 85th percentile for that street does not significantly reduce speeds or accidents.
play video segment42
Play video segment
  • 800 Rutgers

video segment

what do we know about turn restrictions
What Do We Know AboutTurn Restrictions?
  • More a volume reducer than speed reducer
  • Best used at high volume hours
what do we know about the effect of one way streets
What Do We Know AboutThe Effect Of One-Way Streets?
  • Research suggests that one-way streets may in fact increase speeds
  • Two-way streets, on the other hand, tend to reduce speeds because drivers take into account on-coming traffic in their calculation of whether to speed

What Do We Know About

The Effect of Engineering on Speeding Problems in Residential Areas?

  • Education
  • Enforcement
  • Regulation
  • Engineering
traffic calming
Traffic Calming
  • Traffic calming is an approach to reducing vehicle speeds and vehicle volume on particular streets or in particular areas. Traffic calming describes a wide range of road and environmental design changes that either make it:
      • more difficult for a vehicle to speed, or
      • make drivers believe they should slow down for safety.
  • Traffic calming measures are particularly effective at reducing speeds in residential areas.
what traffic calming is not
What Traffic Calming is not …

Stop signs, signals, and speed limit signs are not traffic calming as they require enforcement.

Traffic calming is intended to be


traffic calming history
Traffic Calming History
  • Began in Europe in 1960s as a grass roots movement to slow traffic on residential streets
  • Design engineers picked it up in the 1970s and were able to design “slow streets”
  • Applied it also to some European highways and arterial streets in 1980s
traffic calming in u s
Traffic Calming in U.S.
  • Some traffic calming as early as 1960s sprung up in several U.S. cities
  • Cities such as Berkeley, Seattle, and Portland had early versions of it
  • Many other cities now routinely use traffic calming
  • Traffic calming efforts now exist in each of the 50 states
traffic calming results
Traffic Calming Results
  • Speeds reduced
  • In some cases accidents reduced
  • In many cases, severity of accidents reduced
  • In some cases traffic volume reduced
  • In area-wide traffic calming schemes traffic volume not displaced, and vehicle speeds reduced
traffic calming now used in
Traffic Calming Now Used in …
  • Denmark
  • Sweden
  • The Netherlands
  • Germany
  • Japan
  • England
  • Italy
  • Switzerland
  • Canada
  • Australia
  • U.S.A.
traffic calming 3 ways to reduce speed of vehicles
Traffic Calming3 ways to reduce speed of vehicles
  • Vertical measures – discourages speeding with vertical traffic-slowers in the road such as speed humps
  • Horizontal measures – decreases speed through lateral impediments such as curves in the roadway
  • Narrowing – decreases speed by narrowing curb-to-curb distance so motorists slow down to adapt to changed roadway
types of traffic calming
Types of traffic calming
  • Speed humps
  • Speed tables
  • Chicanes
  • Pinch points
  • One-way streets converted to 2-way streets
  • Roundabouts
  • Small rounds
  • Chokers
vertical speed reducing measures

Vertical Speed Reducing Measures

Speed Humps

Speed Tables

speed humps
Speed Humps

Speed humps are rounded raised areas placed across the roadway. They are generally 3 to 4 inches high and 12 to 14 feet long (in the direction of travel), making them distinct from the shorter "speed bumps” found in many parking lots. The profile of a speed hump can be circular, parabolic, or sinusoidal. They are often tapered as they reach the curb on each end to allow unimpeded drainage.

speed hump profiles
Speed Hump Profiles




speed hump portland or
Speed Hump (Portland, OR)

This speed hump is painted with chevron

markings to make it more noticeable

speed humps59

Speed humpsare relatively inexpensive;

They are relatively easy for bicycles to cross if designed appropriately;

They are very effective in slowing travel speeds; and

Cost is approximately $2,000 (as per Portland (OR), Sarasota (FL), and Seattle (WA).


They cause a "rougher ride" for all drivers, and in some cases, can cause pain for people with certain skeletal disabilities;

They force large vehicles, such as emergency vehicles and those with rigid suspensions, to travel at slower speeds; and

Some people do not find them aesthetically pleasing.

Speed Humps
speed humps effectiveness
For a 12-foot hump

Average of 22% decrease in the 85th percentile travel speeds; or

Average decrease of 35.0 to 27.4 miles per hour (from a sample of 179 sites).

Average of 11% decrease in accidents; or

Average decrease of 2.7 to 2.4 accidents per year (from a sample of 49 sites).

For a 14-foot hump

Average of 23% decrease in the 85th percentile travel speeds; or

Average decrease of 33.3 to 25.6 miles per hour (from a sample of 15 sites).

Average of 41% decrease in accidents; or

Average decrease of 4.4 to 2.6 accidents per year (from a sample of 5 sites).

Speed Humps - Effectiveness

Similar Measures:

  • By lengthening the hump with a flat section in the middle, you have a Speed Table.
  • By turning an entire crosswalk into a speed hump, you have a Raised Crosswalk.
  • By raising the level of an entire intersection, you have a Raised Intersection.
speed hump west palm beach fl
Speed Hump (West Palm Beach, FL)

Signage is important

to alert motorists to

reduce speeds

This 12-foot hump is combined

with textured pavement to

increase visibility and its speed-

reducing effect

speed tables a k a trapezoidal humps speed platforms
Speed Tablesa.k.a. trapezoidal humps, speed platforms
  • Speed tables are flat-topped speed humps.
  • Often constructed with brick or other textured materials on the flat section.
  • Speed tables usually let the entire wheelbase of a passenger car rest on the flat section.
  • Brick or other textured materials improve the appearance of speed tables, draw attention to them, enhancing safety and speed-reduction.
speed table naples fl
Speed Table Naples, FL

Concrete speed table with textured pavement

to increase visibility and reduce speeds

speed tables

They are smoother on large vehicles (such as fire trucks) than Speed Humps.

They are effective in reducing speeds, though not to the extent of Speed Humps.


Without textured materials they are less aesthetically pleasing.

Textured materials, if used, can be expensive.

Speed Tables

Cost: Approximately $2,000 –

Sarasota, FL; Portland OR; Seattle, WA

speed tables65

22-foot speed table

Average of 18% decrease in the 85th percentile travel speeds; or

Average decrease of 36.7 to 30.1 miles per hour; (from a sample of 58 sites).

Average of 45% decrease in accidents; or

Average decrease of 6.7 to 3.7 accidents per year (from a sample of 8 sites).

Similar Measures:

By removing the flat section in the middle, you have a Speed Hump

By placing a crosswalk on the flat section, you have a Raised Crosswalk; and

By raising the level of an entire intersection, you have a Raised Intersection

Speed Tables
horizontal speed reducing measures

Horizontal Speed Reducing Measures


Traffic Circles Roundabouts

chicanes a k a deviations serpentines reversing curves and twists
Chicanes a.k.a. deviations, serpentines, reversing curves, and twists
  • Chicanes are curb extensions that alternate from one side of the street to the other, forming S-shaped curves.
  • Chicanes can be created by alternating on-street parking, either diagonal or parallel, between one side of the street and the other. Parking bays can be created by re-striping the roadway or installing raised, landscaping islands at the ends of each parking bay.
  • Good for locations where speeds are a problem but noise from Speed Humps would be unacceptable.
chicane tallahassee fl
Chicane – Tallahassee, FL

Angled in

Angled out

This chicane uses a series of staggered jutting angles

to slow traffic. By placing edged islands opposite each

other (without staggering) you can create a Choker,

which also slows speeds

chicanes advantages and disadvantages

Chicanes discourage high speeds by strategic road narrowing through forced deflection; and

They are easily negotiable by large vehicles (such as fire trucks) except under heavy traffic conditions.


They must be designed carefully to discourage drivers from deviating out of the appropriate lane;

Curb realignment and landscaping can be costly, particularly if there are drainage issues; and

They may require the elimination of some on-street parking.

Chicanes–Advantages and Disadvantages

Can cost as much as $14,000

traffic circles a k a rotaries intersection islands
Traffic Circles a.k.a. rotaries, intersection islands
  • Traffic circles are raised islands, placed in intersections, around which traffic circulates.
  • Good for calming intersections, especially within neighborhoods, where speeds, volumes, and safety are problems but larger vehicles (e.g., trucks) are not as prevalent.
traffic circle boulder co
Traffic Circle – Boulder, CO

Traffic can exit or go around the circle

This traffic circle uses low maintenance landscaping

and is combined with a raised crosswalk. The circle narrows the traffic lane to slow speeding vehicles.

traffic circles

Traffic Circles are effective in reducing speeds and improving safety.

When designed well, they can be aesthetically pleasing.

When placed at an intersection, they can calm two streets at once.


They can be difficult for large vehicles (such as fire trucks) to navigate.

They must be designed so that the circulating lane does not encroach on the crosswalks.

They may require the elimination of some on-street parking, and

Landscaping must be maintained, either by the residents or by the municipality.

Traffic Circles
traffic circles effectiveness

Average of 11% decrease in the 85th percentile travel speeds, or from an average of 34.1 to 30.2 mph (from a sample of 45 sites).

An average of 73% decrease in accidents, or from an average of 2.2 to 0.6 accidents per year (from a sample of 130 sites).

Similar Measures

By placing a raised island in a mid-block location, you have a Center Narrowing Island.

By enlarging the intersection and the center island, inserting splitter islands at each approach, setting back the crosswalks away from the circulating lane, and implementing yield control at all approaches, you have a Roundabout.

Traffic Circles -- Effectiveness

Cost varies based on materials and size of circle.

traffic circle dayton oh
Traffic Circle – Dayton, OH

Circles don’t need to circulate traffic in all cases

This small traffic circle slows vehicles speeds, even

that of city busses, through this residential street.

Circles slow speeds of two streets at once.


These traffic islands in two residential areas of Eugene, OR

illustrate differences between landscaped and unlandscaped

mid-street measures.

narrowing as a speed reducing measure

Narrowing as a Speed Reducing Measure

Pinch-points, Chokers, and

Small Center Islands or Rounds

choker australia
Choker - Australia

This Choker narrows the road from both sides of the car reducing speeds of vehicles on this residential street.

psycho perception controls another form of traffic calming
Psycho Perception Controlsanother form of traffic calming
  • Attempts at altering ingrained driver responses using certain stimuli to induce or trick drivers to slow down
    • Centerline striping
    • Edgeline striping
centerline and edgeline striping
Centerline and Edgeline Striping
  • Goal is to visually narrow the street
  • Mixed results
  • Bicycle lanes might have more effect than just centerlines or edgelines (painted lines several feet in from curb)



Bike lane


play video segment80
Play video segment
  • Murray Ridge Road

video segment

play video segment81
Play video segment
  • Foothill Blvd and Loring

video segment


Foothill & Loring - Before


2-way southbound

2-way northbound


Foothill & Loring - After

Bike lane

1-way southbound

Turn lane

1-way northbound

A hill

Stop Sign



play video segment83
Play video segment
  • Melrose Avenue

video segment

melrose avenue
Melrose Avenue
  • 6,500 cars per day on this residential street
  • Cars speed as they wind downhill
  • 40 mph average speeds
  • Citizen in conflict over 4-way stop sign
  • Parking lane can be added as was done at the top of the hill
designing out speeding in new developments
Designing out Speeding in New Developments
  • Some growing communities require developers to design new residential areas to prevent traffic problems
  • Some features might include narrower streets, roundabouts for high volume areas, and sharp bends and other “slow points” at regular intervals
  • Some cities are designing residential streets as narrow as 18 feet
play video segment87
Play video segment
  • Oceans Hills Neighborhood

video segment

ocean hills neighborhood
Ocean Hills Neighborhood
  • Residents surveyed, speeding was top of the list of community complaints
  • Officer Snarponis and his lieutenant conducted follow-up interviews with residents
  • Entrance street to neighborhood more than 100 feet wide. Downhill slope as residents exit exacerbates the speeding problem
  • Police should review plans for new developments
  • What could be done to slow speeds of residents exiting this neighborhood?
play video segment89
Play video segment

Corral Canyon

video segment

play video segment90
Play video segment

Otay Ranch

video segment

reducing speeding
Reducing speeding…
  • Interview complaints to determine:
    • if there is really a speeding problem,
    • the times of day, and days of week, it occurs, and if
    • there are certain people who are the worst offenders?
  • Conduct speed survey to determine the 85th percentile
    • train police volunteers to conduct speed survey
    • review the survey data to determine if there is a speeding problem
reducing speeding continued
Reducing speeding - continued
  • If there is not a speeding problem:
    • show the survey data to community members
    • have community members watch you conduct radar to show them that speeding is not occurring
  • If a speeding problem exists, do a visual assessment of the street to look for contributing factors:
    • street width?
    • downward slope?
    • is the street being used as a cut-through?
    • is signage appropriate to the street?
speeding on a street continued
Speeding on a street - continued

5. Hold a community meeting to discuss results of the speed survey and discuss alternatives and the effectiveness of each alternative

► education


► regulation


speeding approaches summary
Speeding Approaches – Summary

Speeding Complaint










Radar and

Photo Radar

Stop Signs

and Speed

Limit Signs











Psycho Motor


Speed Humps

Parking Lanes


Traffic Circles

Speed Tables

Bike Lanes


tracking speeding complaints
Tracking Speeding Complaints
  • Some policing agencies keep a database of speeding complaints, others do not.
  • What is the value of keeping one?
value of tracking speeding complaints
Value Of Tracking Speeding Complaints
  • You know what streets might be the most problematic
  • You can learn if certain days of the week are problematic
  • You can learn if certain times of the day are problematic for that street
  • You know if you’ve had one caller who constantly complains or multiple callers from the same block
  • You know whether your agency has tried to reduce the problem before on the same street
  • You can phone the caller back and tell the caller what you have done to reduce the problem and what the caller can do if the problem still persists (closing the loop)
tracking responses
Tracking Responses
  • Some policing agencies, in their traffic database, also include information about the types of responses tried on the street to reduce the speeding.
  • What is the value of keeping this?
value of tracking responses
Value Of Tracking Responses
  • You know what you’ve already tried and how often you’ve tried it
  • You know whether you have to try something else
  • You can begin to assess costs of responses
  • It gives you ammunition in discussions with traffic engineering if it is the appropriate response
tracking warnings
Tracking Warnings
  • Some policing agencies keep in their database the number of warnings they issue on a street with speeding along with a record of the name of the person who was issued the warning.
  • What is the value of keeping these?
value of tracking warnings names of violators given warnings
Value Of Tracking Warnings & Names of Violators Given Warnings
  • Other officers know whether to give the person a ticket the next time
  • If the speeding problem persists after warnings then you know you need to do something else to reduce the problem
why find out the actual speeds on a street that a citizen has complained about
Why Find Out the Actual Speeds on a Street that a Citizen Has Complained About?
  • Why not just do a visual assessment or some radar or just start issuing tickets?
  • Class discussion
other things to track
Other Things to Track
  • Tracking the amount of time associated with enforcement and education for specific speeding problems.
  • Why? It adds up pretty quickly when you have to go back to the place frequently. Sometimes, the amount of time expended, if significant, can be used to justify an engineering response if is a problem that will continue absent consistent enforcement.
measuring whether what you did worked
Measuring whether what you did worked
  • What is the value of measuring impact when working on a speeding problem on residential streets?
  • What are some different ways you can measure impact?
measuring impact
Measuring Impact
  • The average speeds of vehicles (taken in mid-blocks)
  • The percentage of vehicles speeding
  • The percentage of vehicles exceeding the speed limit by various amounts
  • The number of vehicle crashes
  • The number of injuries caused by vehicle crashes
  • The volume of citizen complaints about speeding

Measures should be taken before deciding

countermeasures, and then after to see if there is an impact

cautions in measuring impact
Cautions in Measuring Impact

1. The number of citations issued is not an appropriate measure of the impact of your responses; it merely provides information about police enforcement levels.

2. Officers should also pay attention to the possible displacement effects of their efforts; drivers may divert to adjoining areas for roads, with positive or negative results.

  • Residential speeding, it’s a common problem.
  • It’s important to know the specifics of the street you want to affect.
  • It’s important to know what approaches work and for how long.
  • You have options in affecting it.
  • Measure whether what you did worked. Did it reduce the speeding problem? If so, by how much?
This project was supported by Cooperative Agreement #2001CKWXK051 by the U.S. Department of Justice Office of Community Oriented Policing Services. Points of view or opinions contained in this document are those of the presenter and do not necessarily represent the official position or policies of the U.S. Department of Justice."

Center for Problem-Oriented Policing