Chapter 6 _3_

Chapter 6 _3_ - Multilane Highway...

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Unformatted text preview: Multilane Highway --------------------------------- Capacity and LOS Multilane highway LOS analysis closely mirrors the procedure for freeways. The main differences lie in some of the adjustment factors and their values. Outline s Multilane Highway LOS s Comparison with Freeway LOS Analysis s Base Conditions s FFS Determination s Flow Rate Calculation s LOS determination Multilane Highway LOS c Design standards (such as speeds) c Traffic signal c Access control c Visual distraction c Separation of opposing directions of flow What are the differences between multi-lane highway and freeway? Examples of Multilane Highways Multilane Highway LOS Input Geometric Data Measured FFS or BFFS Volume BFFS Adjustment Lane width Lateral clearance Median Access frequency Volume Adjustment PHF Number of lanes Driver population Heavy vehicles Compute FFS Compute flow rate Average Passenger-Car Speed Compute density using flow rate and speed Determine LOS BFFS Input Measured FFS Input Base Conditions for Multilane Highway c Level terrain, with grades no greater than 2 percent c Minimum lane width = 12 ft c 12-ft minimum total lateral clearance from roadside objects (right and left shoulders and median) in the travel direction c No direct access points along the roadway Base Conditions for Multilane Highway c Divided highway c Traffic stream composed entirely of passenger cars c Free flow speed of 60 mph or more c Driver population composed principally of regular users Free Flow Speed (FFS)...
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This note was uploaded on 03/10/2012 for the course ECI 161 taught by Professor Tafazzoli during the Winter '12 term at UC Davis.

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Chapter 6 _3_ - Multilane Highway...

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