A study of traffic capacity

摘要: The results of a traffic capacity study started in june 1934 by the bureau ohio state highway department are presented. data were collected photographic method described volume 13 PROCEEDINGS OF THE HIGHWAY RESEARCH BOARD. After brief description collecting and tabulating information, certain selected analyzed to secure measure working two-lane roadway amount vehicle time lost under varying degrees congestion. 1180 groups 100 vehicles each, including not over 10 percent trucks, reveals average free moving speed be about 43 miles per hour on either two or three lane road. When number exceeds 400 600 hour, decreases effect few slow-moving is more pronounced. mean 859 light trucks was 41.0 225 heavy 32.4 hour. for 18 buses, 41.6 In discussion, Mr. Bibbins discusses obtaining over-all speeds stretch recording tag entering checking same leaving. Canning describes running speed. Miller measurement delay counts progress an automobile traffic. record obtained means instrument attached which marks graduated ribbon indicating loss due cross traffic, stop lights, slow congestion, road conditions, etc. Pennsylvania, touring cars equipped with Recordographs that indicate car graphically ribbon. Recordograph analysis found accurate determining highways valuable aid conditions.