Traffic Counts FAQs


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Data Collection Services - FAQs

Do the road tubes provide speed information?
The road tubes that are placed do not automatically provide speed information. A set of road tubes versus one road tube is required and the computer that records the data must be appropriately configured to collect speed data.
Why are we doing traffic counts?
We are undertaking traffic counts at the request of local Government to survey existing traffic conditions. This survey information is collected on a regular basis for Government to understand how traffic is growing or reducing along roadways. This information is used to make long-range projections for road improvements, for resurfacing of roadways, reimbursed by the Federal Government from gas tax revenues.
Can we classify vehicles in congested areas?
In congested areas, traffic volumes can be classified unless vehicles are at a stop or a “crawl” and there is gridlock.
How do you verify that the data collected is accurate?
Verification of data is undertaken many times by checking nearby intersection counts or undertaking manual traffic counts in the same area or at the exact location where the data is being collected. Therefore, both manual and machine counts are often undertaken at the same time to verify the accuracy of the machine data.
How quickly can we get a mechanical count or turning movement count complete?
Under normal circumstances, mechanical or turning movement counts can be completed within one to two weeks of the request to collect the data, depending on the time of year, it is possible that it could take three to four weeks for completion and summary of the information.
What is a Traffic Monitoring System?
A systematic process for the collection, analysis, summary and retention of highway and transit related person and vehicular traffic data.
What is AADT?
Average Annual Daily Traffic - the average amount of daily traffic at a particular location of a road.
What is an ATR?
Automatic Traffic Recorder - device used to collect traffic count data. These machines are mini-computers powered by batteries or solar energy. The “box” is connected to a set of road tubes.
Why conduct a vehicle classification count versus a volume count?
A vehicle classification count is used to determine the percentage of vehicles within the 13-15 class system set forth by the FHWA (Federal Highway Administration), whereas a volume count only determines total number of vehicles without regard to the “type” of vehicle (car, truck, bus, etc.).
What are WIM counts?
Weigh in Motion counts - they determine vehicle weights while vehicles are moving. Data is collected by vehicle classification and weight.

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The Traffic Group, Inc.
SUITE H
9900 FRANKLIN SQUARE DRIVE
BALTIMORE, MARYLAND 21236
Phone: 410-931-6600 1-800-583-8411
Fax: 410-931-6601