1 / 29

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?. Planning/Environment Project Development Operations OHPI needs it MAP-21 . Planning/Environment Needs. Air quality analysis

jeneil
Download Presentation

Traffic Volume Data Collection

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Traffic Volume Data Collection Daniel Jenkins, PE Substitute – Steven Jessberger Office of Highway Policy Information October 23, 2012

  2. Why Collect Volume Data? • Planning/Environment • Project Development • Operations • OHPI needs it • MAP-21

  3. Planning/Environment Needs • Air quality analysis • Noise studies • Traffic projections

  4. Project Development Needs • Interchange Justification Reports • Design • Maintenance of Traffic Decisions

  5. Operations needs • Traffic signal timing • HOV operations • Work zone decisions

  6. OHPI Needs • HPMS • Monthly TVT report • Temporal Traffic Studies

  7. 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)

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

  9. Who wants TVT? • Automotive industry companies • Insurance companies • Financial services • Retail

  10. MAP-21 • 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

  11. QUALITY DATA

  12. Guidance • AASHTO Guidelines for traffic data programs • Traffic Monitoring Guide (TMG) • HPMS field Manual

  13. Types of Sensors • In road/on road • Loops • Piezos (axle sensors) • Tubes

  14. Types of Sensors- cont. • Off road • Infrared • Magnetic • Radar • Microwave • Acoustic • Video

  15. Factors • Monthly Factors • Day of Week Factors • Axle Correction Factors • Yearly Growth/Reduction Factors Determining an accurate AADT is very important to a successful program!

  16. Factors Example - Seasonal

  17. Factors Example – DOW

  18. Factors • 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?

  19. Problem • 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.

  20. Solving Problem • Locate an ATR on a similar class facility

  21. Solving Problem • 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.

  22. Solving Problem • 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

  23. Solving Problem • 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

  24. Solving Problem • Determine AADT for Site A

  25. Solving Problem • Determine AADT for Site A • Calculate ADT for site A • ADT= 3,600/3= 1,200 vpd

  26. Solving Problem • 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

  27. Data- Collect once, correctly and use many times

  28. QUESTIONS????????????? Danny Jenkins, PE Volume Program Manager 202-366-1067 daniel.jenkins@dot.gov

More Related