United States.Federal Highway Administration

The traffic control devices (TCD) are very critical for the safe and efficient transportation of people and goods. The Manual on Uniform Traffic Control Devices (MUTCD), by setting minimum standards and providing guidance, ensures uniformity of traffic control devices across the nation. The use of uniform TCDs (messages, location, size, shapes, and colors) helps reduce crashes and congestion, and improves the efficiency of the surface transportation...

V. 1. General information regarding the installation, operation and maintenance of the Passive Bus Detector (PBD) is discussed. Installation and operation require no special adjustments except tuning the inductive-loop electronics to the loop and lead-in. When operated with a 6-ft x 6-ft loop, correct classification of mass transit (40-ft) busses should reach or exceed 95% with less than 1% false classification.