Transportation Research Record 1801 includes information on roundabout warrants, assessments and improvements of safety at Finnish railway-road grade crossings, retroreflective material specifications and on-road sign performance, and a computational vision model to assess work-zone conspicuity. The papers contained in this volume were among those presented at the 81th Annual Meeting of the Transportation Research Board in January 2002. For abstracts of the individual papers see C 28466 - C 28475.
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