Five full-scale dynamic impact tests were made on two basic geometric designs and one trial design of bridge barrier rails.

The three geometric designs included a standard California Type 1, a standard California Type 2, and a modified Type 1 bridge barrier rail. Each was tested utilizing extruded aluminum pipe rail and cast aluminum posts mounted on a concrete parapet, Figure 1. The concrete parapet used for the aforementioned Type 1 test was repaired and the rail design was modified for two additional tests, one with steel pipe railing on welded steel plate posts (Type 1-A) and one with extruded aluminum pipe railing on malleable iron posts (Type 1-B).