Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 3, Problem 12P
To determine
The time taken by the driver to accelerate the vehicle from 40 mi/h to 45 mi/h.
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You are designing an on-ramp that connects an intersection (controlled by a signal) and the highway. You want to assure that vehicles that are completely stopped at the intersection can reach the prevalent highway speed, which is assumed to be 60mph. Assume that passengers have the maximum acceleration rate of 10 ft/sec2 , trucks have smaller acceleration rate 3.2 ft/sec2 . You can assume that vehicles can use the maximum acceleration rate regardless of the speed. What’s the reasonable length for the ramp?
The car is traveling at 48 km/h when the traffic light 90 m
ahead turns yellow. The driver
takes one second to react
before he applies the brakes.
(a) After he applies the brakes,
what constant rate of
deceleration will cause the car
to come to a stop just as
it reached the light?
(b) How long does it take the
car to travel the 90 m?
3. Flow on a road is q1=1800veh/hr/lane, and density is kl=14.4 veh/km/lane. To reduce
speeding on a section of highway, a police cruiser decides to implement a rolling
roadblock, and to travel in the left lane at the speed limit (v2=88km/hr) for 10 km. This
ensures that no overtaking is done by the vehicles in this platoon. After the police cruiser
joins, the platoon density increases to 20 veh/km/lane and flow drops. Find:
(a) How many vehicles will be in the platoon when the police car leaves the highway
(b) How long it will take for the queue to dissipate
Chapter 3 Solutions
Traffic and Highway Engineering
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- Problem 23: A motorist traveling at 100 kph on an expressway intends to leave the expressway using an exit ramp with a maximum speed of 50 kph. At what point on the expressway should the motorist steps on her brakes in order to reduce her speed to the maximum allowable on the ramp just before entering the ramp? The section of the expressway has a downgrade of 3%. Acceleration is 3.5 m/sec?.arrow_forward. An automobile traveling at a rate of 30 ft/sec is approaching an intersection. When the automobile is 120 ft from the intersection, a truck traveling at the rate of 40 fi/sec crosses the intersection, The automobile and the truck are on roads that are at right angles to each other. How fast are the automobile and the truck separating 2 sec after the truck leaves the intersection?arrow_forwardCurrent Attempt in Progress Car A is traveling at a location where the speed limit is 100 km/h. The police officer in car Pobserves this speed via radar. The driver of car Ais traveling at va - 136 km/h as it passes P, but over the next 5.5 seconds, the car uniformly decelerates to the speed limit of 100 km/h, and after that the speed limit is maintained. At the moment when A passes P, the police car begins to accelerate at the canstant rate of 5.3 m/s? until a speed of 151 km/h is achieved, and that speed is then maintained. Determine the distance s required for the police officer to overtake car A. Answers iarrow_forward
- Two vehicles, one operated by a human and the other computer controlled, are traveling on a level highway. If the autonomous vehicle is traveling at 70 mi/h, and it receives information at a frequency of 10Hz to respond, what is the maximum speed the human-controlled vehicle can travel and have a practical stopping distance that does not exceed that of the autonomous vehicle? (Assume that grade is zero, driver’s reaction time is 1.5s and autonomous vehicle can decelerate at 15.5ft/s2 )?arrow_forwardThe distance traveled by the vehicle in the opposite direction is 100 m on two lane two lane roadway. If the acceleration of overtaking vehicle is 3 km/h/sec and time of initial manoeuver is 4 sec. thus the safe overtaking vehicle speed rounded to integer number is ..........km/harrow_forwardA car is approaching toward an intersection with speed 45 mph. The road has a downhill grade of 1%. When the car is at a distance of 250 ft from the intersection, the signal turned yellow. If the driver applies brake and the reaction time of the driver is 1.5 s, will the driver be able to come to a complete stop? Justify your answer with calculations. Assume braking friction coefficient of 0.35.arrow_forward
- A child accidentally runs into the street in front of an approaching vehicle. The vehicle is traveling at 40 mi/h. Assuming the road is level, at what distance must the driver see the child to stop just in time?arrow_forwardThe length of a highway is 550 m when a head-on vehicle collision occurred. Police reports show that neither human error nor vehicle malfunction was the cause of the collision. Check if the length of the highway is sufficient for an overtaking maneuver. Accident Report: -Speed of Overtaking Car = 96 kph -Speed of Overtaken Car= 88 kph -Perception-reaction time = 2.5 sec -Average acceleration = 2.4 m/sec? -Time of the passing vehicle occupying the left lane (10.4 sec) - Distance between the passing vehicle at the end of its maneuver and the opposing vehicle= 84 marrow_forwardProblem 3. Drivers must slow down from 60 mph to 40 mph to negotiate a severe curve on a rural highway. A warning sign is determined to be visible from 120 ft. away. How far must the sign be located, in advance of the curve, to ensure that vehicles have sufficient distance to decelerate? Use the standard reaction time and deceleration rate recommended by AASHTO for basic braking maneuvers.arrow_forward
- Problem Exercise Traffic flow on a road is 1800veh/hr/lane and density of 14.4 veh/km/lane. To reduce speeding on a section of highway, a police cruiser decides to implement a rolling roadblock, and to travel in the left lane at the speed limit of 88 kph for 10 km. No one dares to pass. After the police cruiser joins the traffic flow, the platoon density increases to 20veh/km/lane and traffic flow drops. • How many vehicles (per lane) will be in the platoon when the police car leaves the highway? WBA 'A. B,arrow_forwardOne vehicle is following another on a two-lane, two-way highway at night according to the safe-driving “rule-of-thumb” of one car length spacing for each 10 mph of speed. Both of you traveling at 70 mph when the lead vehicle crashes into an unlighted disable vehicle. Assuming that one car length is 20 feet, f=0.28 and PIEV time is 1.5 for you, will you hit the lead vehicle? If so at what speed will you be going?arrow_forwardIn anticipation of a long 7° upgrade, a bus driver accelerates at a constant rate of 3 ft/s? while still on a level section of the highway. Knowing that the speed of the bus is 60 mi/h as it begins to climb the grade and that the driver does not change the setting of his throttle or shift gears, determine the distance traveled by the bus up the grade when its speed has decreased to 50 mi/h.arrow_forward
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