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
Refer to our 2013 Traffic Monitoring Program Manual (pdf 1mb)
To view traffic counts on Live Report webpage:
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:
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Traffic in urban Northeastern New Jersey- New York area that serve major industries, warehousing, trucking, logistics and through–truck movements. |
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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. |
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Traffic in Central and Southern New Jersey that serve pharmaceutical companies, retail, warehousing, agricultural and through–truck movements. |
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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. |
Other Helpful Links
Shape file with regions (zip 28m)
Traffic Count 2009-2010 data set with AADTs that can be
imported into a GIS application (MS Access mdb 3mb).
Database file with regions (MS Access mdb 196k)
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