Base Cap = Base capacity in terms of passenger cars per hour per lane (varies by facility type).Cap = Capacity in terms of vehicles per hour.The following equation is used to compute the capacity of all uninterrupted flow facilities (freeways, multi-lane highways, and two-lane rural roads):Ĭap = Base Cap * N * f hv * PHF* f p * f g The HCM defines capacity as "The maximum sustainable flow rate at which vehicles or persons reasonably can be expected to traverse a point or uniform segment of a lane or roadway during a specified time period under given roadway, geometric, traffic, environmental, and control conditions…" The HCM capacity for each facility type is computed according to the equations below.
#AVERAGE SPEED DEFINITION SOFTWARE#
The HCS software computes capacity per the HCM method. HCS implements the following HCM methods: Signalized Intersections, Unsignalized Intersections, Urban Streets, Freeway Basic, Freeway Weave, Freeway Ramps, Freeway Facilities, two-lane Rural Roads, Multi-lane Rural Highways, and Transit. As such, excepting for programming errors, which are corrected as soon as they are found, the HCS software computes the HCM LOS exactly according to the HCM methods. The HCS software is intended to be a faithful implementation of the Highway Capacity Manual.
The section describes how the MOEs are computed by the HCS software, Version 5.2, developed by the University of Florida, in 2005. This section describes the methodologies used by the operations analysis tools to compute the MOEs that were selected for further investigation in Chapter 2. 4.1 Description of MOE Computation Methodologies Variations in the reported MOEs are noted. Then the tools are tested on a simple test bed under both free-flow and congested traffic demand conditions. First the computation methodologies are explained based upon published user guides for each tool and informal correspondence with the software developers. This chapter presents the results of a comprehensive investigation into how commonly used traffic analytical tools define and calculate commonly used MOEs. Traffic Analysis Tools Measures of Effectiveness 4.0 Calculation of MOEs by Traffic Analytical Tools Velocity is a vector quantity.Table of Contents Traffic Analysis Toolbox Volume VI:ĭefinition, Interpretation, and Calculation of Velocity has a magnitude (speed) and a direction. Velocity is the rate of change in an object's position. It may be that the car traveled at instantaneous speeds of 40 mph and 60 mph during that time, but the average speed is 50 mph. If a car traveled 50 miles over the course of one hour then its average speed will be 50 mph. Average Speed - The average speed is calculated by the distance that an object traveled over a given interval of time.The car may be travelling at 50 mph at this moment, but it may slow down or speed up during the next hour. Instantaneous Speed - The speed of an object at a given moment.The measurement of speed can reflect two different scalar quantities. In science and physics the standard unit of measure for speed is generally meters per second or m/s. This is the way the speed of a car is typically measured. In the United States we mostly think of speed in miles per hour or mph.