Motor Carrier Safety, Economics, and Management
ISS-2: The Integration of the Motor Carrier Safety Status Measurement System (SafeStat) into the Roadside Inspection Selection System (ISS)
How the ISS-2 Works (PDF, 135K)
Although the original Inspection Selection System (ISS) was designed to prioritize carriers for roadside inspection, and the SafeStat algorithm was designed to prioritize carriers for monitoring and compliance reviews, both algorithms use similar data to define a relatively "unsafe" carrier. It would be beneficial if there could be one uniform motor carrier rating system in place for all of the Federal Motor Carrier Safety Administration's programs. This paper briefly describes the two algorithms; discusses the integration of the SafeStat algorithm into the ISS; and presents the conclusions of the initial testing of the resulting system, ISS-2.
An analysis of over 213,000 roadside inspections reveals that ISS-2 is just as effective as the original ISS in meeting the goals it was designed for. It successfully identifies, and prioritizes for roadside inspection, vehicles and drivers of carriers with poor prior safety performance, as well as those with few or no previous inspections. In addition, safety inspectors testing the system are very pleased with the new algorithm and the new features present in ISS-2. Thus, the ISS-2 will be fully implemented, and the original ISS will be phased out.
Final Report
Date: January 2000
Authors: Brenda Lantz
Completed Report: DP-134 (PDF, 406K)
For more information about this project, please e-mail brenda.lantz@ndsu.edu.