00335cam a22001097a 4500008004000000082001200040100002700052245007500079260003800154300001300192650002000205180718b1961   xxu||||| |||| 00| 0 eng d  aW4 Y12q  aGreenshields, Bruce D.  aQuality and theory of traffic flowcby Bruce D. Greenshields...[et.al]  abBureau of Highway Trafficc1961  ax, 188p.  aTraffic surveys