SPECIAL TRAFFIC CONTROL TO MEET MOTORIST INFORMATION NEEDS ON LONG, STEEP GRADES (DISCUSSION AND CLOSURE)

A new concept in traffic control devices is evaluated. The subject of the study is a special message information sign on US-14A near Burgess Junction, Wyoming. The sign presents motorists with percent and length of grade information in response to a long sustained 10 percent downgrade. This diagrammatic sign is located in a turnout. Vehicles such as tractor semitrailers, single-unit trucks, motor homes, and vehicles pulling trailers are required to turn out and read the sign. This method for presenting complex information to motorists is effective and the compliance with the required turnout is high.