Advance warning system for use on motorways and other high speed roads, enables early notice of such hazards as accidents, fog and ice, to be given by police on wayside signs operated by remote control; system uses unlit signs made of reflective materials and novel control system for displaying or masking them, based on recent AEI-GRS development for railway signaling, described by E.T.L.Hare.
Warning system for motorways
AEI Eng
AEI Engineering ; 3 , n 2
1963
2 pages
Aufsatz (Zeitschrift)
Englisch
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