Study participants found that, despite constant congestion, SmartSensor HD had 97.88 percent accuracy for the total hourly volume compared to manual counts.

February 09, 2009

LINDON, UT—A study of SmartSensor HD's performance in rush hour has found the sensor to be highly accurate when used in an arterial mid-block installation. The study was conducted in Albuquerque, New Mexico, by representatives of Lee Engineering and Steve O'Connor of Summit Traffic Solutions, an authorized Wavetronix dealer.

On January 7, 2009, a single SmartSensor HD was installed on Coors Boulevard approximately 400 feet away from the intersection with Irving Boulevard. Coors Boulevard is an important, multi-lane arterial in Albuquerque; SmartSensor HD was configured to monitor traffic in the five northbound lanes approaching the intersection. Data was collected in five-minute intervals for one hour during the afternoon peak and compared to manual counts and data from another traffic counting device. Study participants found that, despite constant congestion, SmartSensor HD had 97.88 percent accuracy for the total hourly volume compared to manual counts.

"Where the HD sensor was located, traffic backed up in the northbound lanes every cycle," O'Connor says. "Ninety-eight percent accuracy is incredible in my opinion for the congested conditions that existed over five northbound lanes with stop and go traffic."

Perhaps more impressive, SmartSensor HD was not configured to monitor the southbound lanes but still achieved 93.2 percent accuracies. O'Connor says, "The southbound lanes had free flowing traffic and I would expect upwards of 99 percent volume accuracies if the sensor had been configured for those lanes."

Test results have been forwarded to the City of Albuquerque Traffic Division for evaluation.