Safety at Narrow Bridge Sites

This study for determining methods (other than widening) for reducing the hazards associated with narrow bridges, included the developing of a bridge safety indes (BSI) for determining priorities in dealing with problems involving bridges having restricted width. The BSI approach is presented in the form of tables and figures readily usable by practicing engineers. An example problem is used to define BSI and permit its direct application to practice. The corrective measures to reduce the probability and severity of accidents at potentially hazardous sites are described briefly: realign roadway where sight distance problems are apparent and traffic control measures appear to fail; replace bridge rail (installation of smooth rail increases probability of redirecting vehicle); change approach grades when grade continuity is a problem; install approach guardrail; place edge lines and transition markers; install narrow bridge and advisory speed signs; install signs and remove centerline strips on one-lane bridges; re- route commercial vehicles; and environmental control of distracting lights and other roadside disturbances.