Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 10, Problem 2P
To determine
The factors influencing the vehicles turning right on red indication and the recommendation provided by Highway Capacity Manual, if the field data on the right turn on reds cannot be collected.
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Two 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?
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Draw the intersection diagram for the given traffic volume summary of a T-intersection: (base on the image)
Give way sign is an effective control technique at the intersection of two arterial roads with similar flows.
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Traffic and Highway Engineering
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- Task 3: The Intersection design a. Describe the various principles involved in the design of at-grade intersections and the different types of at-grade intersections. Also, give an example of an appropriate location for the use of each type. b. Design a suitable signal phasing system and phase lengths for the intersection using the Webster method. Show a detailed layout of the phasing system and the intersection geometry used for the geometric and traffic characteristics shown in table 6 below. And the saturation flow of the intersection is shown in table 7 Discuss the effect of increasing saturation flow rates by 10% higher on the cycle length? Table 6:The geometric and traffic characteristics of the intersection Approach (Width) North (56m) South (56 m) East (68m) West (68m) Peak hour approach volumes Left turn 133 73 168 134 Through movement 420 373 563 516 Right turn 140 135 169 178 Conflicting pedestrian volumes 900 1200 1200 900 PHF 0.95 0.95 0.95 0.95…arrow_forwardThe details of a 12-hour volume study for a 4- leg road junction are tabulated below. The N-S major road has two through lanes on each approach while the E-W minor road has one through lane on each approach. Examine the fulfilment of traffic signal Warrants 1 (Condition B) using the MUTCD 2009 standards. Minor Rd. (Higher Major Rd. (Total of approaches) Hour Start approach) Hr 1 Hr 2 Hr 3 734 98 880 122 850 120 Hr 4 955 100 Hr 5 941 105 Hr 6 915 95 Hr 7 1040 140 Hr 8 1010 150 Hr 9 790 156 а. W1B is not met b. W1B is metarrow_forwardA developer has applied for a construction permit to build a supermarket at the southeast cornerof an intersection that is formed by a four-lane divided highway in the east-west direction and atwo-lane road in the north-south direction. Traffic on the two-lane road is controlled by a stop signat the intersection. The speed limit on the four-lane highway is 88 km/h. using the sight trianglerequirements at the intersection (Case B1), determine whether permission should be given for theconstruction if the following conditions exist. Provide a diagram for your solution.Major road lane width = 3.6 mMinor road lane width = 3.3 mMedian lane = 2.8 mDesign vehicle is a passenger carApproach grade = 2%Maximum feasible distance building from the center of the nearest lane of four-lane road = 5.4 mMaximum feasible distance building from the center of the nearest lane of two-lane road = 16.5 marrow_forward
- How many diverging conflicts are present at a 4-leg intersection where each leg is a single lane approach, as shown above? Response Feedback: NBTH with NBLT, NBTH with NBRT EBTH with EBLT, EBTH with EBRT SBTH with SBLT, SBTH with SBRT WBTH with WBLT, WBTH with WBRTarrow_forwardA signaled intersection can improve the traffic density of a certain road segment. Choices: A. True B. Falsearrow_forwardA T-intersection is the meeting point of a two-lane minor road (one lane in each direction) with a two-lane undivided highway (one lane in each direction). The vehicles approaching from the minor road must stop, but the vehicles along the highway do not need to stop. Draw all the traffic movements and count the number of conflict points (i.e., major and minor).arrow_forward
- The following diagram illustrates the number of conflicting points at a 4-approach unsignalized intersection with one lane for each approach. The conflicting points are classified as points for merging, diverging, and crossing. How many conflict points will there be if the intersection geometry is changed to two off-set “T” intersections? Scratch your solution and label all conflicting points by classification.arrow_forwardQUESTION 3 What is the intersection sight distance (ft) needed at a yield controlled intersection for a passenger car to turn left onto a 2- way, 2-lane road with a design speed of 50 mph? [round to the nearest foot]arrow_forwardQUESTION 1 How many merging conflicts are present at a 4-leg intersection where each leg is a single lane approach, as shown above?arrow_forward
- Q3c. At a three leg (T) intersection, the two-way peak hour volume on the minor road is 500 veh/hr and that on the major road is 600 veh/hr. As a Traffic Engineer, what type of intersection control will you propose? What is the basis of your proposal?arrow_forwardThe Module discusses left turn phases at a signalized intersection. Leading left turn phase is the predominant left turn treatment at most signalized intersection. Why do you think leading left tum phase is preferred over lagging left turn phase?arrow_forwardDraw the intersection diagram for a given traffic volume summary of a T intersection and design the most appropriate and logical phasing pattern for the unsignalized intersection.arrow_forward
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