A vehicle moving at a speed of 80 Km/h is slowing traffic on a two-lane highway. What passing sight distance is necessary, in order for a passing maneuver to be carried out safely? Calculate the passing sight distance, assume that the following variables have the values given: • Passing vehicle driver's perception/reaction time 2.5 sec Passing vehicle's acceleration rate 2.4 Km/h/sec • Initial speed of passing vehicle 80 Km/h Passing speed of passing vehicle 100 Km/h Speed of slow vehicle 80 Km/h Speed of opposing vehicle 100 Km/h Length of passing vehicle 6.6 m • Length of slow vehicle 6.6 m • Clearance distance between passing and slow vehicles at lane change 6 m • Clearance distance between passing and slow vehicles at lane re-entry =6 m • Clearance distance between passing and opposing vehicles at lane re-entry = 75m

A vehicle moving at a speed of 80 Km/h is slowing traffic on a two-lane highway. What passing sight distance is necessary, in order for a passing maneuver to be carried out safely? Calculate the passing sight distance, assume that the following variables have the values given: • Passing vehicle driver's perception/reaction time 2.5 sec Passing vehicle's acceleration rate 2.4 Km/h/sec • Initial speed of passing vehicle 80 Km/h Passing speed of passing vehicle 100 Km/h Speed of slow vehicle 80 Km/h Speed of opposing vehicle 100 Km/h Length of passing vehicle 6.6 m • Length of slow vehicle 6.6 m • Clearance distance between passing and slow vehicles at lane change 6 m • Clearance distance between passing and slow vehicles at lane re-entry =6 m • Clearance distance between passing and opposing vehicles at lane re-entry = 75m

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter3: Characteristics Of The Driver, The Pedestrian, The Bicyclist, The Vehicle, and The Road

Section: Chapter Questions

Problem 10P

See similar textbooks

Similar questions

A vehicle moving at a speed of 50 mph is slowing traffic on a two-lane highway. What passing sightdistance is necessary, in order for a passing maneuver to be carried out safely? Calculate the passingsight distance. In your calculations, assume that the following variables have the values given: Passing vehicle driver's perception/reaction time = 2.5 sec Passing vehicle's acceleration rate = 1.47 mph/sec Initial speed of passing vehicle = 50 mph Passing speed of passing vehicle = 60 mph Speed of slow vehicle = 50 mph Speed of opposing vehicle = 60 mph Length of passing vehicle = 22 ft Length of slow vehicle = 22 ft Clearance distance between passing and slow vehicles at lane change = 20 ft Clearance distance between passing and slow vehicles at lane re-entry = 20 ft Clearance distance between passing and opposing vehicles at lane re-entry = 250 ft
Car A is moving with constant speed v on the straight and level highway. The police officer in the stationary car Pattempts to measure the speed v with radar. If the radar measures "line-of sight" velocity, what velocity v' will the officer observe? Evaluate your general expression for the values v = 78 mi/hr, L= 480 ft, and D = 17 ft, and draw any appropriate conclusions. O Answer: v' = L P mi/hr
A car is stopped at an entrance ramp to a freeway; its driver is preparing to merge. At a certain moment while stopped, this driver observes a platoon of vehicles a distance x0 upstream and initiates the merge maneuver. The platoon approaches the entrance ramp at a constant speed v. The stopped car can accelerate from speed 0 to v at uniform acceleration rate a. Find the latest time at which the stopped car can safely start the merge maneuver; i.e., derive an expression for the “latest safe start time” in terms of the variables x0, v and a. Assume this latest time enables the platoon to maintain its constant speed and "just touch" the merging car's trajectory. Ignore the physical dimensions of the car.
1. Data on a traffic accident for the past 4 years has accident rate of 10200 per million entering vehicles. The total number of accidents is 900. Find the average daily traffic (ADT) entering the intersection during the 4 years period. 2. A moving vehicle come up to a danger and traveled a distance of 48 meters during the perception –reaction time of 2.67 seconds. Calculate the specific speed of the vehicle in Kph. a. 20 b. 48.97 c. 52.36 d. 64.70 3. The running speed of a vehicle is equal to a. Travel speed + delay b. Travel speed c. travel speed-delay average of travel speed and delay
1. Assume you are observing traffic in a single lane of a highway at a specific location. You measure the average headway and average spacing of passing vehicles as 3 seconds and 150ft, respectively. What is the average speed of the traffic stream? Note: you can use two methods to conduct the calculation. 2. Assume the speed and density at a freeway location follows a linear relationship. You observe traffic flow rate of 2250 vehicles/hour at 45 mph and 3000 vehicles/hour at 30 mph. What are the jam density, free flow speed (max speed), and capacity of this freeway location? How about the density and speed (i.e., the critical density and the critical speed) at the capacity?
Four race cars are traveling on a 2.5-mile tri-oval track. The four cars are traveling at constant speeds of 195 mph, 190 mph, 185 mph, and 180 mph respectively. Assume you are an observer standing at a point on the track for a period of 30 minutes and are recording the instantaneous speed of each vehicle as it crosses your point. Find the TSM, SMS, q, and k
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)?
For a national highway, the free mean velocity and jam density are 80 kmph and 45 Veh/km respectively. A student mistakenly takes the quadratic relation between the velocity and traffic density in Green-Shield model as shown below: V = All the symbols have the usual meaning. Find the magnitude of error in maximum capacity of the road in Veh/hr (upto two places after decimal)
F] Vehicles travel at constant speeds on a one-lane one-way street between sections X and Y. An observer located at point X observes the four vehicles passing point X during a period of 10 seconds. The speeds of the vehicles are measured as 45, 45, 40, and 30mph, respectively. Calculate the average flow, density, time mean speed, and space mean speed.
Problem 6 Traffic on a single-lane urban street observes the following flow-density relationship: q=30k(1-k/180), where q is the traffic flow in vehicles per hour (VPH), and k is the traffic density in vehicles per mile (VPM). Answer the following questions: a. | Calculate the free flow speed, capacity, and jam density of the traffic flow. b. What is the minimum spacing and the minimum (time) headway of the traffic flow? What is the traffic volume when the travel speed is 20 MPH? C.
Situation 1: Two automobiles A and B are approaching each other in adjacent highway lanes. At t = 0 seconds, A and B are 1 km apart, their speeds are VA = 110 kph and VB = 60 kph and they are at points P and Q respectively. Knowing that A passes point Q, 40 seconds after B was there and that B passes point P, 42 seconds after A was there. Question 6 Question 7 Question 8 Determine the time when they pass each other. Determine the speed of B when they pass each other. Determine the acceleration of A. 25.89 sec O 24,88 m/s O 0.139 m/s^2 O 20.89 sec O 25.12 m/s O -0.278 m/s^2 O 10.89 sec O 23.77 m/s O 0.34 m/s^2 15.89 sec O 22.54 m/s O 0.48 m/s^2
64. 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 30 seconds?