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Roadway Information and
Traffic Monitoring System Program
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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
- 90 permanent Weigh-in-Motion (WIM) system sites and
- 95 Traffic Volume System (TVS) sites
- 50 Major Station Site
(pdf 39k)
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:
- 2016 Seasonal and Axle Corrections factors
based on the geographical regions (pdf 291k)
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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