Evaluating the Content Validity of a New On-Road Driving Test

This study aimed to examine the content validity of on-road tests in real traffic environments over 4 phases. Phase 1: Extracted on-road test items from the previous study. Phase 2: Conducted a semi-structured interview with occupational therapists and driving instructors, and analyzed the qualitative data. Phase 3: Developed texts for the new on-road tests. Phase 4: Conducted a web-based Delphi survey. Phase 1: Extracted the large items (1006 labels) from 18 on-road tests. Phase 2: Categorized 49 items of the on-road tests into the 11 categories. Phase 3: Created new on-road test items. Phase 4: After four rounds of the web-based Delphi survey, consent was obtained for all items from more than 80% of respondents. Finally, we reached a consensus with 44 items in the driving school evaluation and 47 in the public on-road test. Our results support strong content validity of the on-road test regarding driving behavior.