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.
Developed by Rana Sampson
Companion training curriculum to the Speeding in Residential Areas Problem-Oriented Policing Guide developed by Michael S. Scott
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.
Given that speeding is such a common community complaint, does the current police response to it reflect how serious it is to community members?
letter – its intent is to
gain the public’s
Photo Credit: Tony Mazzela
Traffic Calming: State of the Practice
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Discuss the pros and cons of each approach
Method: Radar gun with camera attached. Camera catches the speeding vehicle and the vehicle’s license plate and vehicle owner is sent a ticket
The Effect of Engineering on Speeding Problems in Residential Areas?
Stop signs, signals, and speed limit signs are not traffic calming as they require enforcement.
Traffic calming is intended to be
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.
This speed hump is painted with chevron
markings to make it more noticeable
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
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
Signage is important
to alert motorists to
This 12-foot hump is combined
with textured pavement to
increase visibility and its speed-
Concrete speed table with textured pavement
to increase visibility and reduce speeds
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
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).
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 IntersectionSpeed Tables
Traffic Circles Roundabouts
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 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 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 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
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).
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.
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
Pinch-points, Chokers, and
Small Center Islands or Rounds
This Choker narrows the road from both sides of the car reducing speeds of vehicles on this residential street.
Foothill & Loring - After
5. Hold a community meeting to discuss results of the speed survey and discuss alternatives and the effectiveness of each alternative
Measures should be taken before deciding
countermeasures, and then after to see if there is an 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.
Center for Problem-Oriented Policing