FROM: C. C. Ruth
SUBJECT: Bridge Traffic Barrier Policy
Please refer to Section 8.3.2A of the Bridge Design Manual. The guidelines shall be augmented with the following criteria as it relates to the proper use of the bridge traffic barrier standards:
Use taller 42" safety shape or single slope bridge rails on interstate or freeway routes where accident history suggests a need or where roadway geometrics increase the possibility of larger trucks hitting the barriers at a high angle (such as on ramps for freeway to freeway connections with sharp curvature in the alignment).
This instructional memorandum shall be in place and official until the BDM is amended to include these guidelines.
cc: J. A. Weigel