Department of Transportation

Traffic Volume Counts

NJDOT maintains a traffic monitoring program consisting of continuous and short-term elements. The traffic counting program is designed to utilize, at a minimum, 48-hour short-term counts to produce estimates of Annual Average Daily Traffic (AADT). Traffic Counts are taken in all type of public roads statewide at the following locations:

  • 6,000 Short-Term (48-hour) Count sites
  • 95 permanent Weigh-in-Motion (WIM) system sites
  • 58 Traffic Volume System (TVS) sites
  • 76 Major Station Sites

Refer to our New Jersey Traffic Monitoring Program (pdf 1.5m)

Search Traffic Counts Reports

Short Duration Counts

To compute AADT, the data collected during the short duration counts "48-hour periods" must be adjusted to annual conditions. These adjustments include: axle correction (for counts made with single axle sensors); day-of-week (for counts taken for less than one week); seasonal (to account for changes in volume that occur from one time of year to another); time-of-day (for counts taken for less than 24 hours).

Adjustment Factors by Region:
  • 2019 Seasonal and Axle Corrections factors based on the geographical regions (pdf 291k)

  • 2020 Seasonal and Axle Correction Factors based on the Geographical Regions (pdf 251k)

  • 2021 Seasonal and Axle Correction Factors based on the Geographical Regions (pdf 251k)

  • Note: 2019-2021 factors are posted due to unusual COVID-19 related travel characteristics in 2020-2021. Careful consideration should be used when selecting factors .

    View Region Map (pdf 975k)

  • Region 1: Traffic in urban Northeastern New Jersey- New York area that serve major industries, warehousing, trucking, logistics and through-truck movements.
  • Region 2: Traffic in rural Northwestern section of New Jersey - Pennsylvania - New York area that serve local truck traffic, agricultural, retail and manufacturing with winter season recreational activities and various camping sites during summer.
  • Region 3: Traffic in Central and Southern New Jersey that serve pharmaceutical companies, retail, warehousing, agricultural and through-truck movements.
  • Region 4:Traffic serving the NJ shore, recreational and beach activities including fishing, boating and Atlantic City casinos. This region experiences high traffic during summer time and on summer weekends only.
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