An evaluation of CVISN technologies found that electronic screening techniques that promote compliance with commercial vehicle safety inspections could prevent thousands of truck accidents each year.
Commercial vehicle crashes were relatively rare in the program study area, therefore, safety benefits were estimated using a crash avoidance probability model. The model used inspection selection performance data derived from field testing in order to quantify crash avoidance benefits. Inspection performance data were collected from two sites in Connecticut. The results of limited field testing indicated that Inspection Selection Systems (ISS) used in combination with manual inspection procedures increased OOS order rates by two percent. This inspection performance data was input into the crash avoidance probability model and the results were extrapolated to estimate the number of crashes that would have been avoided if ISS were deployed nationwide.
The benefits extrapolated were dependent on variables such as the accident rate for large trucks, the rate at which out-of-service (OOS) orders were issued, and the probability that OOS conditions would influence crashes. These variables were defined based on historical data records in Connecticut.
The model predicted safety impacts for a number of different potential deployment scenarios that weighted "direct" and "indirect" benefits of CVISN. The "direct" scenario increased the rate of OOS orders if motor carrier targeting was improved. The "indirect" scenario improved motor carrier safety compliance if motor carrier perception of strict enforcement was improved.
The following results were presented in the report; however, the author indicated the results were highly uncertain since the literature-derived crash causation probabilities data input into the crash avoidance model were not well supported.
- The "direct" model indicated that ISS used in combination with manual inspection methods would result in 84 fewer commercial vehicle crashes each year if the two percent improvement seen in Connecticut could be experienced nationwide.
- The "indirect" model calculated crash reduction benefits based on an arbitrary increase in the motor carrier safety compliance rate. For example, if there was a 10 percent increase in the compliance rate, then 8,755 crashes would be avoided each year nationwide, which, compared to the baseline scenario, corresponds to a CVISN benefit of 4,332 fewer crashes.
In addition to the safety analysis, the report summarized the nationwide benefits and costs of electronic credentialing and roadside enforcement by evaluating different levels of deployment and system effectiveness over a 25 year period.
Three different scenarios of roadside enforcement were modeled.
- No screening,
- Screening with no change in compliance.
- Screening with improved compliance.
- VISTA (Vehicle Information System for Tax Apportionment to coordinate IRP data between state credentialing administrators and the state’s registration database).
- No VISTA.
|No electronic screening; ASPEN only (electronic recording)|
|Electronic screening with no change in safety violation rates|
|Electronic screening with 25% reduction in safety violation rates|
|Electronic screening with 10% reduction in safety violation rates|
|Electronic credentialing in states without VISTA|
|Electronic Credentialing in states with VISTA|
Benefit-to-cost ratios ranged from 0.62 (not economically justified for a minimal deployment of roadside enforcement) to approximately 40 (highly beneficial for full deployment of electronic credentialing). The author noted these results were highly dependent on the level of deployment, integration, and cooperation between states.
NotesFor additional detail on how dollar values were attributed to benefits and costs in this study please see A Benefit/Cost Analysis of the Commercial Vehicle Information Systems and Networks (CVISN) Program, Transportation Research Record 1800: Intelligent Transportation Systems and Vehicle- Highway Automation, Paper No. 02-3228, Transportation Research Board, Washington DC. 2002.
Evaluation of the CVISN MDI - Volume II: (Appendices)
Author: Orban, John E., et al.
Published By: Federal Highway Administration, U.S. DOT
Prepared by Battelle and the Charles River Associates for the U.S. DOT
Source Date: March 2002
EDL Number: 13677URL: http://ntl.bts.gov/lib//jpodocs/repts_te//13677.html
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