|-90 crosses the Snoqualmie River at about milepost 47.5. Here, the eastbound portion of the Interstate has the following characteristics: • Rural freeway classification • No HOV lanes • 12 ft lane width • 10 ft right-side shoulders • 4 lanes (there are 3 lanes going westbound for a total of 7 lanes) • 0.80 interchanges per mile • Volume = 2,800 vehicles/hour • Peak hour factor = 0.98 • 18% trucks and buses • 2% recreational vehicles • 4% upgrade for 0.80 miles • Driver population %3D adjustment factor = 1.0. Free flow %3D speed for this section of freeway (to the nearest mile per hour) will be. . *

|-90 crosses the Snoqualmie River at about milepost 47.5. Here, the eastbound portion of the Interstate has the following characteristics: • Rural freeway classification • No HOV lanes • 12 ft lane width • 10 ft right-side shoulders • 4 lanes (there are 3 lanes going westbound for a total of 7 lanes) • 0.80 interchanges per mile • Volume = 2,800 vehicles/hour • Peak hour factor = 0.98 • 18% trucks and buses • 2% recreational vehicles • 4% upgrade for 0.80 miles • Driver population %3D adjustment factor = 1.0. Free flow %3D speed for this section of freeway (to the nearest mile per hour) will be. . *

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter8: Intersection Control

Section: Chapter Questions

Problem 8P

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Similar questions

A new section of Richmond Highway is being designed as a six-lane facility (three ineach direction) with a two-way left-turn lane. Determine the peak-hour LOS.Traffic data:• Directional design hourly volume = 3600 veh/h• PHF = 0.94• Assumed base free-flow speed = 55 mi/h (88 km/h)Geometric data:• Urban setting• Rolling terrain• Lane width = 11 ft (3.3 m)• Shoulder widths = 4 ft (1.2 m) (right side) and 1 ft (0.3 m) (left side)• Average access point spacing = 12 points per mile on each side
A basic segment of a rural freeway has the following characteristics: • Four-lanes (two lanes in each direction)%3B There is one ramp within 3 miles upstream, and 2 ramps within 3 miles downstream; 10-ft lanes; Right shoulder width of 4 ft; • Level terrain;. 10% trucks and 5% buses in the vehicle stream. Calculate the FFS at this freeway section and then determine the level of service (LOS) when the flow rate is 1740 pc/h/In. (Write the answer for the LOS in the box below).
Given: 4-lane urban freeway; Interchange density 1.5/mile; Directional peak flow = 1950 veh/hr; 5% trucks; PHF = 0.90; 11 ft lanes; obstructions 4ft from right edge; Rolling terrain.Determine (a) LOS, and; (b) how much additional traffic could be accommodated before reaching capacity?
A six-lane freeway (three lanes in each direction in mountainous terrain has 10-ft lanes and obstructions 1ft from the right edge. There are five ramps within three miles upstream of the segment midpoint and four ramps within three miles downstream of the segment midpoint. The traffic stream consists of mostly commuter with a peak hour factor of 0.84, peak-hour volume of 2500 vehicles, and 4% recreational vehicles. What is the level of service?
A class IIl two lane highway in rolling terrain services a small built-up area. It has a base free flow speed of 50 mph., the highway has 11 foot lanes and 4 foot clear shoulders on both sides. There are 12 access points/mile, and 85% no passing zones. Current traffic is 525 vehicles per hour, with 12% trucks, 3% RVs, and a PHF of 0.89. The directional distribution is 60-40. What LOS is expected on this facility?
Milel l 1431,62| g0 An Engineer has the following data for a highway segment o (Mpik)| 60 |5211 |34 22 k( Vely 431,62180 I .... a) Estimate the mean free flow speed and jammed density b) What are the maximum flow rate and corresponding density c) What are the average headway and spacing when k= 50 veh./mile solution
A 3.25-mile segment of undivided, four-lane highway is primarily on level terrain. The highway segment does, however, contain one sustained grade of 2.5% that is 3,200 ft long. Other relevant information include: Base free-flow speed = 65 mph %3! 11-ft lanes • 4 ft clearance at the roadside (right side) • 20 access points/mile Peak-hour volume = 1,900 veh/h 13% trucks; 2% RVs • PHF = 0.90 • Familiar facility users At what LOS is the highway expected to operate? (Hint: Three different analyses will be needed: a) the level terrain portion of the highway, b) the 2.5% upgrade portion of the highway, and c) the 2.5% downgrade portion of the highway.)
HW3: LOS of Basic Freeway Given: » Four-lane freeway (2 in each direction) » Lane width =11 ft Right-side lateral clearance =2 ft vV Commuter traffic (regular users) Peak-hour, vV Peak-direction demand volume = 2,000 veh/h 5% trucks, 0% RVs PHF = 0.92 TRD = 4 ramps/mile Rolling terrain v v
Consider the geometric and traffic characteristics shown below. Approach(Width) North(56 ft) South(56 ft) East(68 ft) West(68 ft) Peak hour Approach Volumes: Left Turn 155 95 190 156 Through Movement 442 395 585 538 Right Turn 172 167 201 210 Conflicting Pedestrian Volumes 900 1,200 1,200 900 PHF 0.95 0.95 0.95 0.95 For the following saturation flows: Through lanes: 1,600 veh/h/ln Through-right lanes: 1,400 veh/h/ln Left lanes: 1,000 veh/h/ln Left-through lanes: 1,200 veh/h/ln Left-through-right lanes: 1,100 veh/h/ln The total cycle length was 262 s. Now assume the saturation flow rates are 10% higher, that is, assume the following saturation flow rates: Through lanes: 1,760 veh/h/ln Through-right lanes: 1,540 veh/h/ln Left lanes: 1,100 veh/h/ln Left-through lanes: 1,320 veh/h/ln Left-through-right lanes: 1,210 veh/h/ln Determine a suitable signal phasing system and phase lengths (in s) for the intersection using the…
5. Find the level of service of the following road: (45 points) ▪ ▪ 6-lane multilane highway, terrain: 2 miles long 4% upgrade, speed limit: 55 mi/h lanes: 11ft, a two-way left-tum lane in the median, right shoulder: 5 ft, PHF: 0.90 peak hour traffic volume in each direction: 4500 veh/h with 10% SUTs and 5% TTs ▪ 30 access points in 2 miles ▪ Solution ET = 2.745 fHV = 0.792 Vp 2104 pc/h/In FFS = 50.15 mph c = 2083 pc/h/In S = 46.13 mph D = 45.61 pc/mi/In LOS F
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