Apparatus invented by Danish engineer, A. O. MALVIG, consisting of special ground electric coil laid in road itself; passage of vehicle over coil sends impulse along to relay device; coil contains no movable parts, is not affected by weather or state of roads and suffers no injury by passage of vehicles over it; can also be used for signaling.
Automatic traffic counter and signal control
Roads Road Construction
Roads and Road Construction ; 12 , n 137
1934
Aufsatz (Zeitschrift)
Englisch
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Engineering Index Backfile | 1938
|Automatic traffic signal lights
Engineering Index Backfile | 1928
|