A car is traveling at 15 m/s, when the traffic light 60 m ahead turns yellow. If the car decelerates, the time needed to stop the car atthe light.7 secsO 8 secs5 secs6 secs

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Answered: A car is traveling at 15 m/s, when the…

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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Two sets of students are collecting traffic data at the two sections A and B 200m. apart along the highway. Observation at A shows that 5 vehicles pass that section at intervals of 8.18 sec 9.09 sec 10.23 sec 11.68 sec and 13.64 sec, respectively. Determine the space mean speed.
The uniform arrival and uniform service rates observed on an approach road to a signalized intersection are 20 and 50 vehicles/minutes, respectively. For this signal, the red time is 30 s, the effective green time is 30 s, and the cycle length is 60s. Assuming that initially there are no vehicles in the queue, the average delay per vehicle using the approach road during a cycle length (in seconds, round off to 2 decimal places) is
The traffic volume at the north-south approach of an arterial road intersection is 720 veh/h and 25% of the traffic take right turns. A right-turn-only lane at the signalised intersection of this approach can store a maximum of six vehicles. The cycle time of the traffic light is 90 seconds, the green time allocated for right turns can accommodate a maximum of six vehicles. Determine - the volume (veh/hr) of vehicles taking right turns - the average number of vehicles taking right turns in 90 seconds - the probability of no vehicles staying on the right-turn-only lane during an allocated green time - the probability that there will be a backup of vehicles waiting to turn right thus blocking the lane; and - show the situation of the north-south approach using an appropriate sketch
Q2/ A 3-phase traffic signal (cycle time 114 sec) is used at intersection of approach x, y, and z with equal effective green time at all approaches. Assuming that width of approach= 12 m, % left turning =30. show the following for one of the approaches: a- A sketch showing the sequence of all controller times appearing during one cycle indicating their values. b- Number of vehicles that could be discharge per cycle.
A simple four-legged intersection needs a fixed-time signal. The critical lane flows in the N-S and E-W directions are 950 and 600 veh/hr/ln, respectively. Saturation flow is 1,950 veh/hr/ln and the lost time per phase is 6 seconds. Assume yellow interval is 3 seconds and all red interval is 2 seconds. Determine the cycle length and the distribution of green using Webster’s method.
An approach to a pretimed signal has 25 seconds of effective green in a 60-second cycle. The approach volume is 500 veh/h and the saturation flow rate is 1400 veh/h. Calculate the average vehicle delay (in seconds) assuming D/D/1 queuing. Round off the final answer to whole number (no units).
2. A Hyundai Santa Fe travels a 1.30km levelled road from Bonifacio roundabout to City Lights Hotel in a minimum time of 45.60seconds. Given that the car accelerates and decelerates at 2.53 m/s², which starts from rest at the roundabout and coming to a stop at the Hotel, determine the maximum speed (in kph) and the time (in seconds) it travel at this speed. Assume time for acceleration and deceleration are equal.
3. Compute the average speed that a passenger car should travel in a certain freeway if the spacing if the car moving in the same lane is 40 meters traffic at this instant is 2000 vph. 80 kph center to center. Volume of
Q3/A subway traveling at 40 km/hr decelerates as it reaches point A and slows down with a constant deceleration. Its reduced velocity is noted to be 30 km/hr as it passes point C. A vehicle which is moving at 25 km/hr passes point B at the same instant that the subway reaches point A. In an unwise effort to beat the subway to the crossing, the driver "steps on the gas." (a) Car Calculate the constant accelerations a that the car must have in order to beat subway to the crossing by 2 sec and (b) find the velocity v of the car as it reaches the crossing. E ALSHIBQAT subway A C 0.5 km 10.5 km ‒‒‒‒‒‒‒‒‒‒‒‒‒ B 1.3 km
8. (15 points) Calculate the "clearance period," the "yellow time," and the "all-red period" for a signalized intersection. Assume that the initial vehicle speed, intersection length, and vehicle length are 45 mi/h, 44 ft, and 22 ft, respectively. Also, deceleration rate is 10 ft/s and driver reaction time is 1 second.
The density of traffic in a certain observation point on a highway was recorded to be 30 veh/km. If the space mean speed of the vehicle is 50 kph, how many vehicles will be passing every 20 minutes? OA 255 O B. 750 OC. 50 O D. 500 O E. None of the above
Based on the following traffic speed frequency table, the median and 85th percentile speeds are approximately & respectively. Speed class (kph) 30- <40 40- <50 50- <60 60- <70 70- <80 80- <90 90- <100 100- <110 Frequency 8 12 20 25 22 15 8 a none

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A car is traveling at 15 m/s, when the traffic light 60 m ahead turns yellow. If the car decelerates, the time needed to stop the car at the light. O 7 secs 8 secs 5 secs O 6 secs