Activities of separate governing agency maintaining system roadways, boulevards and drives of Chicago Park District; reversible lane used in 1935; mechanical traffic dividers separate roadway into several combinations of lanes in either direction; modern signal programs; annual travel on Park District boulevards and drives is now approaching 1.5 billion vehicle miles.
Chicago's urban highways
Traffic Eng
Traffic Engineering ; 22 , n 12
1952
Article (Journal)
English
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