Traffic volume data collection
Download
1 / 29

Traffic Volume Data Collection - PowerPoint PPT Presentation


  • 113 Views
  • Uploaded on

Traffic Volume Data Collection. Daniel Jenkins, PE Substitute – Steven Jessberger Office of Highway Policy Information October 23, 2012. Why Collect Volume Data?. Planning/Environment Project Development Operations OHPI needs it MAP-21. Planning/Environment Needs. Air quality analysis

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Traffic Volume Data Collection' - vincent-cabrera


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Traffic volume data collection

Traffic Volume Data Collection

Daniel Jenkins, PE

Substitute – Steven Jessberger

Office of Highway Policy Information

October 23, 2012


Why collect volume data
Why Collect Volume Data?

  • Planning/Environment

  • Project Development

  • Operations

  • OHPI needs it

  • MAP-21


Planning environment needs
Planning/Environment Needs

  • Air quality analysis

  • Noise studies

  • Traffic projections


Project development needs
Project Development Needs

  • Interchange Justification Reports

  • Design

  • Maintenance of Traffic Decisions


Operations needs
Operations needs

  • Traffic signal timing

  • HOV operations

  • Work zone decisions


Ohpi needs
OHPI Needs

  • HPMS

  • Monthly TVT report

  • Temporal Traffic Studies


Tvt report
TVT Report

  • Data Requirements

    • ATR data submitted to TMAS by the 20th of the month after the close of the month

    • TMAS software performs a number of quality checks on data

      • 7 day error

      • 7 zero hour error

      • Adjacent hour error

      • Directional split error

      • MADT check same month year to year

      • Maximum volume per hour per lane (new in 2012)


Report available at http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm


Who wants tvt
Who wants TVT? http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Automotive industry companies

  • Insurance companies

  • Financial services

  • Retail


Map 21
MAP-21 http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • National freight policy

    • Designate National freight network (AADTT)

  • HSIP

    • Traffic data defined as safety data Crash rates based on VMT

  • Performance measures

    • Congestion reduction

    • System reliability


Quality data
QUALITY DATA http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm


Guidance
Guidance http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • AASHTO Guidelines for traffic data programs

  • Traffic Monitoring Guide (TMG)

  • HPMS field Manual


Types of sensors
Types of Sensors http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • In road/on road

    • Loops

    • Piezos (axle sensors)

    • Tubes


Types of sensors cont
Types of Sensors- cont. http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Off road

    • Infrared

    • Magnetic

    • Radar

    • Microwave

    • Acoustic

    • Video


Factors
Factors http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Monthly Factors

  • Day of Week Factors

  • Axle Correction Factors

  • Yearly Growth/Reduction Factors

    Determining an accurate AADT is very important to a successful program!


Factors example seasonal
Factors Example - Seasonal http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm


Factors example dow
Factors Example – DOW http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm


Factors1
Factors http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Misusing the DOW factor can lead to a 5% underestimate

  • Misusing the Monthly factor can lead to a 15% overestimate

  • Do you factor and are you following the TMG or some other method?


Problem
Problem http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • The DOT did a traffic count on a minor rural collector (Site A) between January 26-28 (Tuesday-Thursday). The total count for three days was 3,600 vehicles. Calculate the AADT for Site A.


Solving problem
Solving Problem http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Locate an ATR on a similar class facility


Solving problem1
Solving Problem http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Locate an ATR on a similar class facility

    • Found a ATR on a rural minor collector in the adjacent county with the following characteristics:

      • 290,800 veh./yr.

      • January traffic- 19,800 veh.


Solving problem2
Solving Problem http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Locate an ATR on a similar class facility

    • Found a ATR on a rural minor collector in the adjacent county with the following characteristics:

      • 290,800 veh./yr.

      • January traffic- 19,800 veh.

    • Calculate AADT and MADT for the ATR site

      • AADT=290,800/365= 797, say 800 vpd

      • MADT= 19,800/31= 640 vpd


Solving problem3
Solving Problem http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Locate an ATR on a similar class facility

    • Found a ATR on a rural minor collector in the adjacent county with the following characteristics:

      • 290,800 veh./yr.

      • January traffic- 19,800 veh.

    • Calculate AADT and MADT for the ATR site

      • AADT=290,800/365= 797, say 800 vpd

      • MADT= 19,800/31= 640 vpd

    • Compute monthly correction factor

      • AADT/MADT = 800/640 = 1.25


Solving problem4
Solving Problem http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Determine AADT for Site A


Solving problem5
Solving Problem http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Determine AADT for Site A

    • Calculate ADT for site A

      • ADT= 3,600/3= 1,200 vpd


Solving problem6
Solving Problem http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

  • Calculate AADT for Site A

    • Calculate ADT for site A

      • ADT= 3,600/3= 1,200 vpd

    • Calculate AADT

      • AADT= 1,200 X 1.25= 1,500 vpd

        DOW factor would also need to be applied


Data- Collect once http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm,

correctly and

use many times


Questions

QUESTIONS????????????? http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.cfm

Danny Jenkins, PE

Volume Program Manager

202-366-1067

[email protected]


ad