Answered: a) State and explain briefly, four (4)…

a) State and explain briefly, four (4) justifications for the installation of traffic signals. b) What are the main disadvantages of traffic signal controlled intersection in Kumasi.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter10: Capacity And Level Of Service At Signalized Intersections

Section: Chapter Questions

Problem 3P

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Concept explainers

Intersection Design

An intersection is a location where two or more roads or railways meet or join. The traffic movement is controlled at the intersection that depends on its design and type. It governs the operation, efficiency, speed, capacity, and safety of the highways, airways, and railways. The movement of the pedestrian causes hazards and delays at the intersection.

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b) What are the main disadvantages of traffic signal controlled intersection in Kumasi.
QUESTION 3 # How many crossing conflicts are present at a 4-leg intersection where each leg is a single lane approach, as shown above?
PLEASE WRITE THE SOLUTIONS A T-intersection has a total of 2,400 collision incidents over the last 5 years. Given that the annual daily traffic recorded for this period is 57,079. Determine the accident rate of the intersection per million entering vehicle? A__23.039 accidents per mev. B__23.309 accidents per mev. C__23.093 accidents per mev. D__23.390 accidents per mev. The design speed of a parabolic curve is 80 kph having a soil grade of g1 = 3% and g2 = -4% with Sp =550m. Determine the length of the curve? A__2112m B__2113.5m C__2113.510m D__2131.510m If a town has a total of 152,400 registered vehicles in 2016. Determine the rate of accident per 9,000registered vehicles if the number of accidents on the same is 356? A__21.024 accidents per 9,000 vehicles B__22.024 accidents per 9,000 vehicles C__20.024 accidents per 9,000 vehicles D__None of the above
Q5a. Otwebeweate has been selected as the capital of a newly created district. As the new District Engineer, the Chief and the elders of the town approach you and make a request for the installation of a traffic light at one of the key intersections with the reason that there is no single traffic signal in the town and the installation of one will lift the status of the town as a district capital. What will be your decision and how will you explain it to the Chief and elders
Question 2 a) Name the four control measures an engineer can implement to encourage traffic calming? b) What is the ideal street width to create "yield street" in a residential neighborhood with low parking demand? c) Does research suggest that the installation of a yellow-centerline is associated with higher or lower traffic speeds?
QUESTION 1 The approaches of a 4-leg signalized intersection are configured with 1 NB lane, 1 SB lane, 1 EB lane, and 1 WB lane and each of these lanes serves LT, TH, and RT movements. The following volumes and phasing are provided. approach EB WB NB SB movement LT TH RT LT TH RT LT TH RT LT TH RT volume 120 480 160 80 560 100 20 200 40 12 160 48 2 6 What is the critical sum for the EB/WB barrier?
A 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).
Design the intersection given the following vehicular volumes per leg in pcu.
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.
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…
suggest any five (5) ways by which severe traffic congestion may be minimised
Explain, illustrate and prove why 4-legged intersection has 16 crossing conflicts, 8 merging conflicts and 8 diverging conflicts.