Use of roadway dividing curbs that can be elevated or retracted by hydraulic power system, which is electrically actuated, on new 8-lane access road to Chicago business district, providing traffic with six in and two out lanes, or two in and six out lanes, or four lanes each way; hydraulic jacks and springs for raising and lowering curb and curb-lighting equipment.
Chicago builds convertible roadway
Eng News-Rec
Engineering News-Record ; 124 , n 23
1940
4 pages
Aufsatz (Zeitschrift)
Englisch
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