The National Academies

SHRP 2 S09 [Completed]

Site-Based Video System

  Project Data
Funds: $1,041,898
Research Agency: Regents of the University of Michigan
Principal Investigator: Timothy Gordon
Effective Date: 2/28/2007
Completion Date: 4/30/2010

Project snapshot. More details below.

(Project Number)
Impact on Practice
Product Status

A Site Observer system that accurately captures vehicle trajectories through an intersection, documenting all vehicle trajectories.
Traffic conflict measures can be derived from the vehicle trajectories. Broad classes of driver behavior can also be inferred from vehicle trajectories, for example the effects of distraction or impairment are seen in terms of reaction delays or path-following errors. The system easily demonstrates the effects of different traffic signal-timing cycles on safety, congestion, and vehicle delay.
The report Site-Based Video System Design and Development is available at www.trb.org/Main/Blurbs/166323.aspx

Staff Responsibility: Walter Diewald

The SHRP 2 Safety research program focuses on a naturalistic driving study (NDS) that monitors drivers in their cars and records information about each car trip.

The objectives of this project were to develop a portable, automated video system that provides exposure-based, surrogate measures of collision risk and to conduct a field study to demonstrate the relationship of the surrogate measures produced to actual crash frequencies. 

This project developed a site-based video system that can capture vehicle trajectories in a robust and reliable way, with sufficient accuracy and fault-free operation to support a wide range of future safety improvement projects. The system complements the in-vehicle data collection system developed in SHRP 2 project S05 (Design of the In-Vehicle Driving Behavior and Crash Risk Study). While the site-based system cannot directly record individual driver behaviors, it does have access to the full range of traffic interactions and it fills an important gap in the vehicle-based study. Also, broad classes of driver behavior can be inferred from the vehicle trajectories, for example, the effects of distraction or impairment are seen in terms of reaction delays or path following errors.

Status: The project is complete.

Product Availability: SHRP 2 Report S2-S09-RW-1:
Site-Based Video System Design and Development is available as a web-only document.

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