Laserfiche WebLink
-1 OF 14 <br />A. <br />L <br />u 'Zfi IBC VISION PLAN 2o18 TRAFFIC STUDY UPDATE - <br />ALTERNATIVES ANALYSIS <br />Final <br />6 GLOSSARY OF TRANSPORTATION TERMS <br />Common Abbreviations <br />ADT Average Daily Traffic <br />ITAM Irvine Traffic Analysis Model <br />Caltrans The California Department of Transportation <br />DU Dwelling Unit <br />HCM Highway Capacity Manual <br />HCS Highway Capacity Software (Software package utilizing the formulae in the Highway Capacity Manual) <br />HOV High Occupancy Vehicle lane <br />ICU Intersection Capacity Utilization <br />ITAM Irvine Traffic Analysis Model <br />OCTA Orange County Transportation Authority <br />OCTAM Orange County Transportation Analysis Model <br />TSF Thousands of Square Feet <br />V/C Volume/Capacity Ratio <br />VMT Vehicle Miles Traveled <br />AUXILIARY LANE: A non -capacity enhancing lane that provides operational benefits to the freeway mainline. <br />Typically an auxiliary lane extends between an on -ramp and off -ramp to facilitate the weave movement <br />between the interchange without detrimental effects to the mainline through lanes. <br />AVERAGE DAILY TRAFFIC: The total volume during a year divided by the number of days in a year. Usually <br />only weekdays are included. <br />BANDWIDTH: The number of seconds of green time available for through traffic in a signal progression. <br />BOTTLENECK: A constriction along a travelway that limits the amount of traffic that can proceed downstream <br />from its location. <br />CAPACITY: The maximum number of vehicles that can be reasonably expected to pass over a given section of <br />a lane or a roadway in a given time period. <br />CHANNELIZATION: The separation or regulation of conflicting traffic movements into definite paths of travel <br />by the use of pavement markings, raised islands, or other suitable means to facilitate the safe and orderly <br />movements of both vehicles and pedestrians. <br />CLEARANCE INTERVAL: Nearly same as yellow time. If there is an all red interval after the end of a yellow, <br />then that is also added into the clearance interval. <br />CRITICAL MOVEMENT: Conflicting intersection turning movements that are found to have the highest ICU for <br />opposing movements; i.e. each of the approaches at a four -legged intersection will contain a critical <br />movement that conflicts with an opposing movement. <br />DAILY CAPACITY: The daily volume of traffic that will result in a volume during the peak hour equal to the <br />capacity of the roadway. <br />'.: �'''•' ......... ' . <br />Iteris, Inc. 192 <br />