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Auto Incident Recording System (AIRS)

Uploaded By: Bill Benson Reference Number: AA-00343 Views: 1602 Created: 2015-03-23 00:07 Last Updated: 2015-04-15 17:04 0 Rating/ Voters

The Auto Incident Recording System (AIRS) is a sound-actuated video recording system. It automatically records potential incidents when activated by sound (horns, clashing metal, squealing tires, etc.). The purpose is to detect patterns of crashes at intersections for use in implementing relevant improvements. Videos of incidents and near-incidents were obtained after AIRS was placed in service at an intersection in Louisville, KY, on July 22, 2001. Crash reports were obtained from January 1998 through September 2004 to: a) compare to the available data from AIRS videos and b) compare the crashes before and after various improvements were made. A traffic conflict study was made at the intersection, and the traffic conflict data was compared to results obtained from AIRS and to the crash summary.

AIRS consists of two video cameras located on two corners of the intersection to capture incidents from different perspectives. The system also includes two directional microphones (one per camera) that listen for "crash-like" sounds such as "metal-against-metal" contact, broken glass, horns honking, and squealing brakes.

The video cameras capture three stages of each crash or "near-incident" before, during, and immediately after. Video and sounds are recorded continuously on an 8-second digital memory loop. This continuous loop eliminates the task of watching countless hours of video that do not contain crashes. When the system detects an evident collision, another 4 seconds of video capture ensues. Then the 8-second loop is transmitted to a video recorder in the unit, capturing the sights and sounds of the intersection 4 seconds prior to the crash, during the instant of the crash, and 4 seconds after the crash. Afterward, the system returns to recording 8-second loops until another crash or "near-miss" incident occurs. The system also captures the phase of the traffic signals by monitoring the current to the signal head and pedestrian signs. The signal phase then is encoded onto the recorded video for review. A benefit of the system is that near-incidents triggered by tires squealing or horns honking allow the traffic engineer even greater insight into traffic patterns at the intersection and driver habits.

AIRS can assist highway engineers at high-incident volume intersections to determine the root cause of incidents. There are no attachments for this article.

Details
Agency/Organization (or Publication/Conference):TRIMARC
State:Kentucky
Year:2007 or previous
Website:

http://www.trimarc.org/perl/about_trimarc.pl

National Unifying Goal (NUG) Strategies:TIM Partnerships & Programs, TIM Technology, Multidisciplinary Communication Practices & Procedures
Industry Topics:On Scene Management\Quick Clearance, Traffic Management
Resource Type:Other
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