34 40 00
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Transportation Signaling and Control Equipment
Includes signaling and control equipment used to monitor, direct, and control traffic, safety, and environmental conditions in transportation systems.

34 40 00 Transportation Signaling and Control Equipment
34 41 00 Roadway Signaling and Control Equipment
34 42 00 Railway Signaling and Control Equipment
34 43 00 Airfield Signaling and Control Equipment
34 48 00 Bridge Signaling and Control Equipment