CSA game plan coming soon, FMCSA official says
Posted January 12, 2018
The Federal Motor Carrier Safety Administration (FMCSA) will soon release its plan to overhaul the Compliance, Safety, Accountability (CSA) scoring system, the agency’s chief of enforcement announced on January 9.
Upgrading the CSA Safety Measurement System (SMS) will be a multi-year process, said Joe DeLorenzo, director of FMCSA's Office of Compliance and Enforcement, speaking at the 2018 Annual Meeting of the Transportation Research Board in Washington, D.C.
The revision plan is overdue; Congress asked the FMCSA to have it done by December 5th. It’s expected to describe how the agency will implement recommendations issued last year by the National Academy of Sciences (NAS).
Among the recommendations are better data collection and use of a new statistical model known as Item Response Theory (IRT), which is sometimes used to grade hospitals and schools but has never been used in the transportation sector, DeLorenzo said.
Fed the right data, the IRT model can be used to assess a motor carrier’s overall “safety culture,” he said.
“We’re not trying to predict crashes,” he added, “but we are trying to identify those behaviors that carriers engage in that can lead to crashes.”
The IRT model incorporates many of the existing elements of the SMS but is more transparent and — like the SMS — can be used to monitor and identify carriers for interventions, DeLorenzo said.
The NAS report says the SMS is “conceptually sound” but “much of what is now done is ad hoc and based on subject-matter expertise that has not been sufficiently empirically validated.”
DeLorenzo cited speeding as a good example of that. In developing the SMS, FMCSA experts reached the common-sense conclusion that the faster a driver speeds, the greater the risk of a crash. Thus, the higher the speed, the more points get assigned to the violation in the SMS.
When a sampling of speeding violations was run through the IRT model, however, the conclusion was much different. The model predicted that speeds of 6-10 mph over the limit result in greater crash risk than speeding by 15 mph or more, DeLorenzo said. Making the IRT model successful requires good data. The CSA scoring system has long been criticized for relying on faulty data, and one key area of improvement will be data on carrier exposure to risk, DeLorenzo said.
“How can we better adjust for exposure?” he asked. “Is there a better source of vehicle miles traveled on a carrier level that we can use? Because that data is so critical and so important.”
The agency expects to work with industry, enforcement agencies, the NAS, and many others over coming years to improve data quality, DeLorenzo noted.
The following is the FMCSA’s timeline for implementing changes to the SMS, as noted during the agency’s presentation:
- Now: Initiate project, gather information
- Spring 2018: Data analysis
- Summer-Winter 2018: Small-scale IRT modeling
- Winter 2018-Summer 2019: Full-scale IRT modeling
- Summer-Fall 2019: Evaluation and implementation of the plan
This article was written by Daren Hansen of J. J. Keller & Associates, Inc.
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