12 - Chapter6-Multilane and Two-Lane

# 12 - Chapter6-Multilane and Two-Lane - HCM Analysis:...

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HCM Analysis: Multilane Highways & Two-Lane Highways TTE 4004 10/12/11

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Recap – Basic Freeway Segment Also: LOS F – anytime demand exceeds capacity S v D p =
Recap – Basic Freeway Segment

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Recap – Basic Freeway Segment: Free-Flow Speed
Recap – Basic Freeway Segment: Analysis Flow Rate 1. Adjust for PHF 2. Adjust for vehicle mix 3. Adjust for driver population p HV p f f N PHF V v × × × = Eq. 6.3

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Recap – Basic Freeway Segment: PHF 4 15 × = V V PHF Where: PHF  = peak-hour factor, V  = hourly volume for hour of analysis, V 15  = maximum 15-min flow rate within hour of analysis, and 4 = number of 15-min periods per hour. Eq. 6.4
Recap – Basic Freeway Segment: f HV Eq. 6.5 ( 29 ( 29 1 + 1 + 1 1 = - - R R T T HV E P E P f Where: f HV  = heavy-vehicle adjustment factor, P T  = proportion trucks and buses in the traffic stream, P R  = proportion recreational vehicles in the traffic stream, E = passenger car equivalency for trucks and buses,         from Tables 6.7, 6.8 and/or 6.10), and E R  = passenger car equivalency for recreational vehicles,          from Tables 6.7, and/or 6.9).

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Multilane Highways
Multilane Highway Characteristics Generally have posted speed limits of between 40 and 60 mi/h They usually have four or six lanes, often with physical medians or two-way left-turn-lane (TWLTL) medians, although they may also be undivided They are typically located in suburban communities leading to central cities or along high-volume rural corridors that connect two cities or significant activities generating a substantial number of daily trips Traffic signals may be found along such highways, although traffic signals spaced at 2.0 mi or less typically create urban arterial conditions

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Multilane Highway Characteristics The key factors that distinguish multilane highways from freeways are as follows: Vehicles may enter and leave the highway at intersections and driveways, and through the median at selected points Traffic signals may be located on this type of facility The general design standards of multilane highways tend to be lower than those found on freeways, although an ideal multilane highway approaches freeway conditions as access points and turning volumes approach zero The visual setting and developed frontage along multilane highways have more impact on drivers than do the development and location of such features along freeways
LOS Determination Procedure 1. Establish Base Conditions and Capacity 2. Estimate or Measure Free-Flow Speed 3. Calculate Analysis Flow Rate 4. Calculate Density and Determine LOS

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## This note was uploaded on 12/07/2011 for the course TTE 4004 taught by Professor Staff during the Fall '08 term at University of Florida.

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12 - Chapter6-Multilane and Two-Lane - HCM Analysis:...

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