They are activated by the passage of a train over a detection circuit in the track, except in those few situations where manual control or manual operation is used. Section 4: Identification of Alternatives (continued)Īctive traffic control devices are those that give advance notice of the approach of a train. Railroad-Highway Grade Crossing Handbook - Revised Second Edition August 2007 FHWA - Railroad-Highway Grade Crossing Handbook - 4 Identification of Alternatives
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