Technological innovation in grade crossing protective systems. Technical report., by John B. Hopkins et al.

Title:	Technological innovation in grade crossing protective systems. Technical report.
Author:	Hopkins, John B.
Author:	Hazel, M. E.
Note:	1971

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Subject:	Collision Prevention/ Collision Avoidance
Subject:	Collisions
Subject:	Costs
Subject:	Crossing Signals
Subject:	Electrical impedance
Subject:	Grade crossing protection systems
Subject:	Highway Engineering Costs
Subject:	Highway engineering
Subject:	Microwave Systems
Subject:	Microwave communication systems
Subject:	Prevention
Subject:	Radar
Subject:	Railroad grade crossings
Subject:	Railway Crossings
Subject:	Detectors
Subject:	Sensors/ Transducers
Subject:	Transducers
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