By adding pavement where side road enters highway, thus channeling roadway vehicles, automatic gates now serve instead of manually operated gates on Boston and Maine crossing; gates are short arm type, with arm extending across each right hand highway traffic lane, leaving other lane unobstructed to permit vehicles to depart from crossing.
Traffic lanes for crossing gate protection
Ry Signaling Communications
Railway Signaling and Communications ; 48 , n 3
1955
2 pages
Aufsatz (Zeitschrift)
Englisch
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