An investigation was conducted to determine the delay at Sohar downtown intersection. The traffic signal at the intersection operates with a cycle time of two minutes. The test was conducted on the 2 lane road over a 15- minutes period. The count interval was 20 seconds and the empirical adjustment factor 0.8. The total number of vehicles is 610, total number of vehicles in queue is 382, and the total number of stopped vehicle is 276. Assume the traffic density is 85 vehicles/km and the flow is 2650 vehicles/hr. Evaluate the following: i. Number of vehicles stopped per lane each cycle ii. Acceleration/Deceleration correction delay jii. Fraction of vehicles stopping iv. Control delay for each vehicle

An investigation was conducted to determine the delay at Sohar downtown intersection. The traffic signal at the intersection operates with a cycle time of two minutes. The test was conducted on the 2 lane road over a 15- minutes period. The count interval was 20 seconds and the empirical adjustment factor 0.8. The total number of vehicles is 610, total number of vehicles in queue is 382, and the total number of stopped vehicle is 276. Assume the traffic density is 85 vehicles/km and the flow is 2650 vehicles/hr. Evaluate the following: i. Number of vehicles stopped per lane each cycle ii. Acceleration/Deceleration correction delay jii. Fraction of vehicles stopping iv. Control delay for each vehicle

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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.

Question

An investigation was conducted to determine
the delay at Sohar downtown intersection. The
traffic signal at the intersection operates with
a cycle time of two minutes. The test was
conducted on the 2 lane road over a 15-
minutes period. The count interval was 20
seconds and the empirical adjustment factor
0.8. The total number of vehicles is 610, total
number of vehicles in queue is 382, and the
total number of stopped vehicle is 276.
Assume the traffic density is 85 vehicles/km
and the flow is 2650 vehicles/hr. Evaluate the
following:
i.
each cycle
Number of vehicles stopped per lane
ii.
Acceleration/Deceleration correction
delay
ii.
Fraction of vehicles stopping
iv.
Control delay for each vehicle

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The traffic from a suburban area to a city uses the following five shorter routes, as shown below. Access from Suburban Route 4 Route 1 Route 5 Route 2 Route 3 Access to City The models below show the travel time as a function of traffic flow on each route. t₁ = 18 + 4.5 x₁ t₂ = 21+ 7.0 x₂ t3 = 26 + 4.9 x3 t4 = 29+ 3.4 x4 t5 = 34 + 0.3 x5 Where: t; is travel time on route 'i' (in minutes) and x; is traffic flow on route 'i' (in 1000 vehicles).
7.24 Vehicles arrive at an approach to a pretimed signalized intersection. The arrival rate over the cycle is given by the function v(t) = 0.22 + 0.012t [v(t) is in veh/s and t is in seconds]. There are no vehicles in the queue when the cycle (effective red) begins. The cycle length is 60 seconds and the saturation flow rate is 3600 veh/h. Determine the effective green and red times that will allow the queue to clear exactly at the end of the cycle (the end of the effective green), and determine the total vehicle delay for this approach over the cycle (assuming D/D/1 queuing).
An observer notes that an approach to a pretimed signal, the time it will take the queue to clear after the start of the effective green (assuming that approach capacity exceeds arrivals and D/D/1 queuing applies) is 60 s. If the saturation flow rate is 1440 veh/h and the effective red time is 40 seconds, what is the maximum number of vehicles in a queue in a given cycle?
Recent computations at an approach to a pretimed-signalized intersection indicate that the volume-to-capacity ratio is 0.8, the saturation flow rate is 1600 veh/h, and the effective green time is 50 seconds. If the uniform delay is 11.25 seconds per vehicle, determine the arrival flow rate (in veh/h) and the cycle length.