Design Information Bulletin 60 (DIB 60)
Design Information Bulletin Number 60 (DIB 60) - Operational and Safety Improvements at Freeway Interchanges - The purpose of this DIB is to disseminate the results of research studies on methods of rehabilitating freeway interchanges that develop operational and safety problems after construction.
State of California
Business, Transportation and Housing Agency
||ALL DISTRICT DIRECTORS
Project Development Branch Chiefs
Fred Jackson, Chief
Sacramento Project Design Unit
|November 4, 1982
||DEPARTMENT OF TRANSPORTATION
Division of Transportation Facilities Design - Office of Planning and Design
||Design Information Bulletin 60 - Operational and Safety Improvements at Freeway Interchanges
To disseminate the results of research studies on methods of rehabilitating freeway interchanges that develop operational and safety problems after construction.
It is recommended that copies of this Bulletin be distributed down to the Project Design Engineer level.
A recent research report published by FHWA includes a systematic method of identifying alternatives for freeway interchange improvement projects. Information is presented in a series of 9 charts that relate the more common operational and safety problems of freeway-arterial interchanges to potential solutions.
The application of this procedure should help designers find the best solution without limiting the range of solutions or excluding the exercise of engineering judgment.
RECOMMENDATION FOR USE:
The attached charts and text are reprinted verbatim from report No. FHWA/RD-81/104,Volume II Design Procedures for Rehabilitation of Freeway-Arterial Interchanges, dated May 1982.
Use of the charts is discretionary not mandatory. They are intended as design aids in the preparation of PWP's and Project Reports for interchange rehabilitation projects.
A copy of the complete FHWA report has been sent to each District and the Headquarters Transportation Library.
R. J. Datel, Chief
Office of Planning and Design