A vehicle is moving at 50 mph and suddenly sees an object. It applies the brakes and slows down to a speed of 15 mph. Calculate the following: a. Distance the vehicle would move before driver activates the brakes. (Use design PIEV time of 2.5 seconds) b. distance the vehicle moved after application of brakes to drop to 15 mph speed (assume constant Ideceleration rate of 11.2 ft/sec²)

A vehicle is moving at 50 mph and suddenly sees an object. It applies the brakes and slows down to a speed of 15 mph. Calculate the following: a. Distance the vehicle would move before driver activates the brakes. (Use design PIEV time of 2.5 seconds) b. distance the vehicle moved after application of brakes to drop to 15 mph speed (assume constant Ideceleration rate of 11.2 ft/sec²)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: 35. Determine the minimum speed of a car at the point the brakes are immediately applied to avoid a…

Q: A car was travelling at a speed of 76 kph. The driver saw a roadblock 81 m ahead and stepped on the…

Q: Compute the total stopping sight distance (in feet) that a car moves during an emergency stop based…

A: Given, Initial velocity, Vo= 35MPH Final velocity, Vf = 0 Perception reaction time,t = 0.8sec Slope…

Q: Knowing that the coefficient of static friction between the tires and the road is 0.80 for the…

Q: A car is traveling at a speed of 80 f/s when the brakes are suddenly applied, causing a constant…

Q: Speed (mph) A car starts from rest an of 60 mph in 20 seconds during this period is con 20 minutes,…

A: The given figure can be divided into three parts as shown below. Time is given in seconds so speed…

Q: A moving car is traveling at 80 kph when the brakes are applied to it. The car still moves at a…

A: From the given data Speed V = 80 kmph = 80*5/18 = 22.222 meter/sec Distance D = 35 m…

Q: The motorcycle is traveling at 1 m/s when it is at A. If the speed is then increased at ?=0.1m/s².…

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

3)
A vehicle is moving at 50 mph and suddenly sees an object. It applies the brakes and
slows down to a speed of 15 mph. Calculate the following:
a. Distance the vehicle would move before driver activates the brakes. (Use design PIEV
time of 2.5 seconds)
b. distance the vehicle moved after application of brakes to drop to 15 mph speed (assume
constant Ideceleration rate of 11.2 ft/sec²)

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1: Introduction and given data

VIEW

Step 2: Calculation

VIEW

Solution

VIEW

Step by step

Solved in 3 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

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

One vehicle is following another on a 2 lane highway at night. According to the rule of right thumb, one car length of clearance per 10mph speed exists between cars. If both vehicles are traveling at 60mph and the lead car crashed into the rear of an unlighted parked truck, at what speed will the rear car hit the wreckage? (Assume a reaction time of 2.5 seconds, car length= 18ft and a coefficient of friction of 0.65. Is the rule of thumb safe? Under the prevailing conditions in this example what is the minimum space in terms of car length between cars for every 10mph speed to avoid the crash?
Calculate the minimum sight distance required on a two way two lane road for the two vehicles approaching each other from opposite directions with the velocity of 30 m/s and 45 m/s. Take: Reaction time = 2 sec Coefficient of friction = 0.37
A driver on a level two-lane highway observes a truck completely blocking the highway. The driver was able to stop her vehicle only 10 ft from the truck. If the driver was driving at 70 mi/h, how far was she from the truck when she first observed it (assume perception-reaction time is 2.0 seconds)? How far was she from the truck at the moment the brakes were applied (use a/g=0.35)?
2.30 An engineering student is driving on a level roadway and sees a construction sign 500 ft ahead in the middle of the roadway. The student strikes the sign at a speed of 25 mi/h. If the student was traveling at 55 mi/h when the sign was first spotted, what was the student's associated perception/reaction time (use practical stopping distance)?
The car is traveling at a constant speed through a dip in the road. The radius of curvature of the road at point A, the bottom of the dip is 471m. What speed of the car (kph) would result in an acceleration of magnitude 0.2g when the car is at A? use 3 decimal places
The distance traversed during perception-reaction time is equal to 10 meters if the speed of the car is 10 meters per second, and the perception-reaction time of the driver is 1 second. TRUE OR FALSE
What is the intersection sight distance (m) needed at a stop controlled intersection for a passenger car to turn left onto a 2-way, 4-lane road with a design speed of 80 km/h? Assume the vehicle turns into the closest lane. [round to the nearest meter] Response Feedback: ISD=0.278V t major g Remember, tg is increased by 0.5 seconds for the additional lane.
Someone can help me with this one, please.
Problem 2 A project by some to monitor the traffc safety at a busy intersection. They measwre (with a precision stopwatch) that exactly three seconds after car B passes through the intersection traveling south at vg = 55 mph, minivan A passes through at va = 70 mph on the road that runs at an angle 0 = 60° east of north. The speed of each automobile is Civil Engineering students requires them constant. Determine (a) the relative velocity (in mph) of B with respect to A, draw the vector triangles as part of your answer (b) the change in position (in fi) of B with respect to A during a 10-s interval, (c) the distance (in ft) between the two automobiles 3 s after A has passed through the intersection.
2. The speed of 35 cars was observed. 20 cars were noted to travel at 45 kph, 8 cars at 50 kph, 2 cars at 60 kph, and 5 cars at 65 kph. Assuming that each car was traveling at constant speed, a. determine the time mean speed b. determine the space mean speed
Perception reaction time t ??
A car is moving at a speed of 72 km/hr on road having 2% upward gradient. The driver applies brakes when he sees an obstruction. If his reaciton time is 1.5 seconds, assuming that the co-efficient of friction between the pavement and tyre as 0.15, calculate the distance traversed before the car finally stops.