Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 9, Problem 17P
To determine
The average travel speed ATS in each direction.
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Students have asked these similar questions
An undivided multilane highway segment has the following characteristics:
• Six lanes (three lanes in each direction);
Lane width of 11 ft;
• Speed limit of 45 mph;
Right shoulders is 4 ft wide;
• There are approximately 25 access points over a 2-mile section of this roadway, in each
direction.
Calculate the FFS at this highway section and then determine the level of service (LOS) when the
flow rate is 1100 pc/h/In.
(Write the answer for the LOS in the box below).
Q1/ Use the following speed data collected from 2-lanes freeway section of 0.5 km under free-
flow conditions, determine: 1- density, 2-space headway, 3- time mean speed, 4- space
mean speed, 5- standard deviation, 6-variance.
Speed, kph
Frequency
36-40
8
41-45
10
46-50 51-55 56-60 61-65
14
22
17
11
66-70 71-75
12
4
76-80
2
Determine the approximate center to center spacing of vehicles in a certain lane if the average speed of the cars using that particular lane is 40 kph and the volume of traffic is 800 vph
Chapter 9 Solutions
Traffic and Highway Engineering
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- 1- You are assigned to evaluate the level of service for a section of a six-lane rural highway that stretches along a level terrain with shoulder width of eight ft and lane width of twelve ft. The average annual daily traffic is fifty-five thousand vehicles per day with ten percent trucks, five percent buses, and three percent recreational vehicles. The peak hour factor is 0.80 and the directional split is fifty-fifty. The distance between consequent interchanges is two miles. Calculate the level of service for this highway section and show your calculation steps.arrow_forwardTraffic volume is 2578 veh/hr with 687 vehicles arriving in peak 15 minutes.There are tow lanes, 12 percent trucks(30/70 split for SUT/TT), the length of the road is 1.8 miles long with a 3.5 percent grade. calculate the analysis flow rate?arrow_forwardQUESTION 3 If the free flow speed is measured in the field, you do not estimate free flow speed using the BFFS and adjustments for lane width, lateral clearance, and presence of ramps. O True Falsearrow_forward
- for a freeway section, the free-flow speed is estimated to be 55mph. Analysis flow rate is found to be 1500 pc/h/in what is te LOS. IF CHART OR GRAPH WHERE USED PLEASE EXPLAIN BELOWarrow_forwardTwo adjacent signalized intersections along a major arterial are 650 ft apart (stop line to stop line distance). If the space mean speed between these two intersections is 22 mph, what should be the signal offset of the downstream intersection relative to the upstream intersection? Group of answer choices 20.0 sec 13.5 sec 40.0 sec 29.5 secarrow_forward3. An intersection approach has two lane groups: left-turn lane group, and through/right-turn lane group. The control delay is 37 seconds/vehicle for the left-turn lane group, and 27 seconds/vehicle for the through/right-turn lane group. The analysis flow rate is 97 vehicles/hour for the left-turn lane group, and 450 vehicles/hour for the through/right-turn lane group. Calculate the approach control delay and write the corresponding level of service (LOS) for the approach in the box below.arrow_forward
- Tubibi Highway is a Class II Two-lane highway that is considered a level terrain. Based on the data, 1,631 passenger cars travel on average per hour for both directions with a directional split of 50/50. A maximum of 388 passenger cars is recorded within a 15-min time segment of the peak hour. The traffic stream contains 2% large trucks, 3% buses, and 3% recreational vehicles. Determine the opposing direction flow rate in pc/hr. Answer in two decimal places. 2,953.65 776 margin of error +/- 0.5arrow_forwardA new freeway ramp meter will be installed on the Medina onramp to westbound SR 520. There is 70 ft from the ramp meter stop line back to the nearest intersection, and each stopped vehicle takes up an average of 20 ft. The desired meter rate is one vehicle every 10 seconds, while the arrival rate averages one vehicle arrival every 11 seconds. What is the average queue length? 55ft O 4.5 ft 100ft 90ftarrow_forwardProblem 2: A Class III two-lane highway is on level terrain, has a measured free-flow speed of 45 mi/h, and has 100% no-passing zones. During the peak hour, the analysis direction flow rate is 150 veh/h, the opposing direction flow rate is 100 vehh, and the PHF = 0.95. There are 5% large trucks and 10% recreational vehicles. Determine the level of service.arrow_forward
- 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 165 105 200 166 Through Movement 447 400 590 543 Right Turn 162 157 191 200 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 283 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…arrow_forwardA six-lane freeway (three lanes in each direction) in mountainous terrain has 10-ft lanes and obstructions 1 ft 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 commuters with a peak hour factor of 0.84, peak-hour volume of 2500 vehicles, and 4% recreational vehicles. What is the level of service? (Write the letter only)arrow_forwardIna road-intersection near Dhaka, average 120 cars make right-hand turns in every hour. Road planner wants to put in a 3-vehicle right- hand turn lane in the intersection to avoid blocking of thru traffic. Determine if 3-vehicle right-hand turn lane satisfy the following design criteria: Red light time of right-hand traffic is 30 seconds Right-hand turn lane must be sufficient 90% of the time.arrow_forward
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