Systems provided on conventional open sections of motorway must be included in motorway tunnels, but generally at a much higher density. Emergency telephones are usually provided at approximately 60 m intervals, compared with 1.5 km on open sections. CCTV cameras and traffic loops are provided at similarly higher densities. The exact equipping of a tunnel will depend on many factors, including length, gradient, location, local regulations, and size and form of tunnel section.
Traffic monitoring and control in motorway tunnels
Verkehrsueberwachung und -steuerung in Strassentunnels
Electronics and Power ; 32 , 4 ; 305-308
1986
4 Seiten
Article (Journal)
English
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