Welcome to DVRPC's Travel Monitoring page for counting Vehicles.
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Why Do We Count?
The Office of Travel Monitoring performs vehicle counts for one of several reasons:
- PennDOT contracts with DVRPC to perform annual counts in PennDOT’s District 6, consisting of upwards of 1500 counts;
- project counts for District 6 that are not part of the annual PennDOT request;
- counts to help calibrate and maintain the travel demand model and for a 5 year travel trends report;
- project counts for DVRPC project managers as they are needed.
Type of Counts
Total volume on a segment of roadway in either an hourly or 15 minute interval.
A count on a segment of roadway that differentiates between the different types of vehicles that have passed over the counter tubes. A completed count will have all 13 FHWA (Federal Highway Administration) classifications. These classifications range from motorcycle to segmented tractor trailer.
Using ATR the approximate speed of passing vehicles can be determined, with an average speed being calculated.
A class count that is conducted on site for a road segment during a 6 hour period either 6 am to noon or noon to 6 pm. This classification uses a 16 vehicle type identification schema provided by PennDOT.
8 Day HPMS Sample
An 8 day count at DOT specified locations to collect vehicle volume samples for HPMS reporting.
A count of vehicles making all the movements, or turns, in and through an intersection. This count is conducted either manually at the intersection or video recorded and transcribed at a later time.
Annual Average Daily Traffic (AADT)
An estimate of all the traffic during a 24-hour period at the location indicated for the year in which it was collected.