Search results
This document describes a laboratory activity for a Highway Engineering course involving a running speed study. Students will use a moving vehicle technique to collect travel time and delay data along a test route.
The present study demonstrates the influence of operating speed on capacity of a midblock section of urban road. Speed–flow data collected at 12 midblock sections of 6-lane and 4-lane divided urban …
Free Flow Speed: Average vehicles speed under free flow conditions (low traffic volume conditions). Design Speed: 95th Percentile Speed is used as the maximum safe speed for the design of the roadway elements. Speed Limit: 85th Percentile speed is usually posted as the roadway speed limit.
This lab experiment measured the running speed along a 6.7km route using a moving vehicle technique. Data on travel times, delays, and traffic volumes were collected during trips in both the eastward and westward directions.
In addition to collecting spot speeds of vehicles traveling through the study area, test runs can be used to confirm free-flow speeds and compare study area speeds to adjacent areas outside the speed zone.
Speed data is needed for a variety of traffic analyses. Spot speed data refers to measurement of individual speeds of vehicles passing a point on a roadway. Care must be taken to conduct the study appropriately so that the sample data will adequately reflect speed characteristics of the population.
Spot Speed Study Purposes: Establishing the speed zone of new or existing speed limit or enforcement practices. To determine speeds at the problem locations; to validate whether speeds are too high. For traffic operation and control; to establish speed limits. to determine safe speeds at curves.
