Abstract
The objective of this project was to evaluate the safety performance of widely used nonproprietary roadside safety features by using the AASHTO Manual for Assessing Safety Hardware (MASH). Features recommended for evaluation included longitudinal barriers (excluding bridge railings); terminals and crash cushions; transitions; and breakaway supports. Evaluation methods included, but were not limited to, engineering assessment, simulation, full-scale crash testing, pendulum testing, and component testing. Where practical, cost-effective modifications to systems that do not meet the new criteria were recommended for future evaluation. This report explores the process that was followed in developing NCHRP Research Results Digest (RRD) 349: Evaluation of Existing Roadside Safety Hardware Using Manual for Assessing Safety Hardware (MASH) Criteria.
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