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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.
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 objective is to evaluate traffic movement and delays.
To get a complete speed scenario of this road section data were taken on both weekdays and weekends in four different time periods that include morning peak (8.00a.m-9.00a.m), off-peak (11.00a.m-12.00p.m), evening peak (6.00p.m-7.00p.m) and night time (9.00p.m-10.00p.m).
Spot speed: instantaneous speed of a vehicle at a specified cross-section or location. Average speed: it is the average of spot speeds of all the vehicles passing a given point on the highway. Running speed: It is the average speed maintained by a vehicle over a particular stretch of road, while the vehicle in motion.
Spot speeds are useful to study paints of congestion, for locating traffic signals, or for enforcing speed limits. Running speeds are useful to assess the traffic capacity of highways.
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.
Calculate Vehicle Speeds To calculate vehicle speed, use the predetermined study length and the elapsed time it took the vehicle to move through the course (as recorded on the stopwatch data form) in the following formula (Robertson 1994): V = T D 1.47, (2.2) where V = spot speed (mph), D = length (feet), and T = elapsed time (seconds). In the ...
