The federal government requires states which permit third party testing of commercial drivers to determine whether these tests are equivalent to those given by the state driver licensing authority. To meet this requirement, the California Department of Motor Vehicles (DMV) plans to sample commercial driver license (CDL) applicants tested by their employer, retest them at DMV, and compare the fail rates for the employer and DMV tests to determine if they are equivalent in difficulty and reliability. In order to make this determination, it is necessary to estimate the reliability and other psychometric properties of the California DMV CDL test. Without this information, it is not possible to determine whether differences between the DMV and employer test exceed what would be expected from repeat administration of the CDL test by DMV. In the present study, a sample of CDL applicants was drawn from 9 of the 10 DMV regions which existed in the state at the time of the sampling. The 131 drivers in the sample were required to complete a test and a retest by DMV. Total test scores were used to calculate fail rates and mean scores. The reliability of the test was very low. The original intent to use the current CDL drive test as a baseline for evaluating third party testing cannot be supported based on the results of this study. The low reliabilities, in particular, underscore the need to consider revising the present DCL drive test.


  • English

Media Info

  • Features: Appendices; References; Tables;
  • Pagination: 24 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00726008
  • Record Type: Publication
  • Report/Paper Numbers: CAL-DMV-RSS-95-149
  • Created Date: Sep 24 1996 12:00AM