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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

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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)
slide8

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

who wants tvt
Who wants TVT?
  • Automotive industry companies
  • Insurance companies
  • Financial services
  • Retail
map 21
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
guidance
Guidance
  • AASHTO Guidelines for traffic data programs
  • Traffic Monitoring Guide (TMG)
  • HPMS field Manual
types of sensors
Types of Sensors
  • In road/on road
    • Loops
    • Piezos (axle sensors)
    • Tubes
types of sensors cont
Types of Sensors- cont.
  • Off road
    • Infrared
    • Magnetic
    • Radar
    • Microwave
    • Acoustic
    • Video
factors
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!

factors1
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?
problem
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.
solving problem
Solving Problem
  • Locate an ATR on a similar class facility
solving problem1
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.
solving problem2
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
solving problem3
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
solving problem4
Solving Problem
  • Determine AADT for Site A
solving problem5
Solving Problem
  • Determine AADT for Site A
    • Calculate ADT for site A
      • ADT= 3,600/3= 1,200 vpd
solving problem6
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

slide28

Data- Collect once,

correctly and

use many times

questions

QUESTIONS?????????????

Danny Jenkins, PE

Volume Program Manager

202-366-1067

[email protected]

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