The first report in this volume gives a comprehensive summary of all reports in the three volumes. Emphasis is on the relations among studied areas, their merits and applications. The following three reports are concerned with the characteristics and statistical properties of multilane freeway traffic. Headways, speeds, and other important traffic distributions are plotted for two-, three- and four- lane freeways. Their statistical properties are studied. Procedures are developed to obtain these distributions from aerial data.
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