Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Chapter 3, Problem 13P
To determine
The height of the driver eye assumed by the student.
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The radius of the horizontal curve is 280 m. long having a super elevation of 0.06. How fast can a car move along the curve in kph if it has a coefficient of lateral friction equal to 0.12.
a. 88.87 kph
b. 88.78 kph
c. 77.87 kph
d. 77.78 kph
1. A parabolic curve has an ascending grade of 4% which meets a descending grade of 3% at sta. 1+ 180 whose elevation is at 320 m. Compute the elevation of the PVT(point of vertical tangency) if the length of the curve is 280 m
2. The driver of a car traveling at 65 mph saw an obstruction ahead. If the reaction distance is 72.2 m, compute the reaction time.
A vehicle traverses a superelevated curve at 52 kph. If the radius of the curve is 64 meters, and the coefficient of friction is equal to 0.3, calculate the angle of superelevation (0) as measured from the horizontal.
Chapter 3 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
Ch. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7PCh. 3 - Prob. 8PCh. 3 - Prob. 9PCh. 3 - Prob. 10P
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- Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle of 30degrees. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tures and the road is µs. The banked curve is frictionless, and the car can negotiate it at the same maximum speed v0. Find the coefficient of static friction between the tires and the road.arrow_forwardTwo vertical parabolic curves have been connected to form a roadway by three gradients: -5.30 %, 4.10 % and -3.70 % respectively. If the length of the second curve is twice as the length of the first curve, compute the following: a. The length of the second curve in ft given that the design speed of the first curve is 80 kph assuming a vertical radial acceleration of 0.3m/s2 for comfort criterion. b. The length of the second curve in m if the headlight height of the vehicle is 0.73 m above the first curve and the inclined upward angle of the headlight beam relative to the horizontal plane of the vehicle is 1.57% The design speed for the first curve for this situation is 90 kph. c. The length of the first curve in yard if the total length of the roadway is 7451 m given that the second curve has a design speed of 70 kph for passing sight distance with the driver's eye height assumed to be 1.5 m and object height of 0.33 m. d.The total length of the roadway in km if a bridge…arrow_forwardA horizontal curve on a two-lane highway is designed with a 610-m radius, 3.5-m lanes, and 80 kph design speed. Determine the distance that must be cleared from the inside edge of the inner lane to provide sufficient stopping sight distance. (Note: Curve radius is typically reckoned from the centerline of the roadway, and driver location is assumed to be at the middle of the travelled lane.) Assume coefficient of friction as 0.35. ANSWER M =4.0 ?arrow_forward
- A crest vertical curve is to be designed to join a +3% grade with a -2% grade at a section of a two-lane highway. Determine the minimum lenght of the curve if the design speed of the highway is 96km/h, S<L, and a perception-reaction time of 2.5 sec. The deceleration rate for braking (a) is 3.41 m/s2arrow_forwardYou are asked to design a horizontal curve for a two-lane road. The road has 12 ft lanes. Due to expensive excavation, it is determined that a maximum of 34 ft can be cleared from the roads centerline toward the inside lane to provide to provide for stopping sight distance. Also, local guidelines dictate that a maximum superelevation of 0.08 ft/ft. What is the highest design speed possible for this curve?arrow_forwardWhen aligning a highway in a traffic area, it is necessary to provide a horizontal circular curve of radius 295 m , if the design speed is 60 kph , determine the superelevation rate. ( Superelevation to fully counteract centrifugal force use only 75% of the design speed).arrow_forward
- A section of a two-lane rural highway consists of a -3% grade intersecting a +4.5% grade. The speed limit on the highway is 55 mph. The height of headlights of an average car is 2.4 feet with a beam angle of 1.50. Determine the length of sag vertical curve that joins the two grades, considering a safe stopping maneuverarrow_forwardA crest vertical curve joins two gradients of 3% and - 2% for a design speed of 80 km/h and the corresponding stopping sight distance of 120 m. The height of driver's eye and the object above the road surface are 1.20 m. and 0.15 m respectively. The curve length (which is less than stopping sight distance) to be provided isarrow_forwardA horizontal curve is to connect PC on freeway B and PT on freeway A to serve traffic turning from freeway B be two freeway A if the design speed is 45 mph (66 ft per second) super elevation is 2.5 and the coefficient of friction between tire and pavement is .10 what should be the minimum radius of the horizontal curve in feet?arrow_forward
- A vertical curve is going to be designed to join a 0% grade with a +5% grade at a section of a highway. The station and elevation of the PVC point are 5+00 and 12 ft, respectively. Assuming AASHTO design standard values for perception-reaction time, deceleration rate for braking, and driver’s eye and object heights, determine the following: 1. The min length of the curve if the design speed is 65 mi/h. 2. The station and elevation of the PVT. 3. The station and elevation of the high or low point. 4. The elevation of the point at station 6+50.arrow_forwardthe maximum allowable speed of a car that could travel a circular curve is 72 kph if the impact factor is 0.16 determine the degree of circulararrow_forwardDesign a vertical summit parabolic curve connecting two tangent grades, a 5% grade intersecting a -3.4% grade at station 1 + 990 with an elevation 42.30 meters. The parabolic curve shall conform with the following safe stopping sight distance requirements. Design velocity = 60 kph Height of driver’s eye from the road pavement = 1.37 meters Height of an object over the pavement ahead = 100 mm. Perception/reaction time = 0.75 second Coefficient of friction between the road pavement and the tires = 0.15 Determine the following: Stopping sight distance The length of the curve The elevation of the highest point on curve.arrow_forward
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