Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Chapter 15, Problem 23P
To determine
The appropriate speed
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Chapter 15 Solutions
Traffic and Highway Engineering - With Mindtap
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- A two-lane minor road intersects a two-lane major road at 90° forming a four-leg intersection with traffic on the minor road controlled by a yield sign. A building is located 125 ft from the centerline of the outside lane of the major road and 35 ft from the centerline of the nearest lane of the minor road. a) Determine the maximum speed that can be allowed on the minor road if the speed limit on the major road is 45 mi/h. b) If the speed limit on the major road were 40 mi/h, determine the minimum distance that the building can be located from the centerline of the outside lane of the major street.arrow_forward3. Drivers must slow from 70 mph to 40 mph to negotiate a severe curve on a rural highway. A warning sign for the curve is visible for 100 ft. How far in advance of the curve is it necessary to post the sign to insure that vehicles are able to properly decelerate? Assume f-0.30, G=0.0% and perception reaction time is 2 sec.arrow_forward2/97 Determine the maximum speed for each car if the normal acceleration is limited to 0.88g. The roadway is unbanked and level. 21 m fo 16 m Problem 2/97arrow_forward
- 2. The intersection is controlled with a stop sign on the minor road. The four-lane major road with a median width of 9 ft has a design speed of 55 mph. Determine the minimum sight distance required for a passenger car on the minor road to safely turn left onto the major road. The approach grade of the minor road is 5 percent.arrow_forwardDrivers must slowdown from 65mi/h to 45mi/h to negotiate a severe curve on a rural highway. A warning sign for the curve is clearly visible for a distance of 150 ft. How far in advance of the curve must the sign be located to ensure that vehicles have sufficient distance to decelerate safely? Use the standard reaction time 2.5 s and deceleration rate 11.2 ft/s recommended by AASHTOarrow_forwardA curving roadway has a curve with a radius of 580 m. The superelevation has been set at 0.05, angle of 65o and the coefficient of side friction is found to be 0.20. In addition, the traffic engineer has designed the speed as 100 km/hr.i. Explain whether this designed speed will provide a safe vehicle operation or not?ii. Find middle ordinate M,arrow_forward
- A certain roadway designed to have a speed limit of 45mph. If the superelevation is 6 and the coefficient of side friction is 0.15, determine the minimum radius (ft) of the curve.arrow_forwardBecause of a visible obstruction along a horizontal curve drivers can only see a stop sign until they are at 250 feet upstream of the sign. Can vehicle stop before the stop line if the perception reaction time is 2.5 seconds and deceleration rate is 11.2 ft./s^2 what should be a reasonable posted speed limitarrow_forwardPlz, solve this problem. Transportation Engineering-2 A four-lane highway (2 lanes in each direction) with 3.65m lanes has a horizontal curve designed for a 380 m centerline radius, and a 110 km/hr design speed. The grade is level. Use a driver perception reaction time of 2.5 sec and a vehicle deceleration rate of 3.4 m/sec2. Determine the closest distance any roadside object may be placed to the centerline of the inside lane of the roadway.(note: Do not round any value. Use calculated values).arrow_forward
- A car is traveling up a 1.25% grade of a crest curve with a design speed of 65 mph. The descending grade is -2.75%. What is the required length of curve for minimum proper stopping sight distance? AASHTO Minimum Stopping Sight Distances on Level Roadways (based on braking distance) stopping sight distance design speed (mph) braking distance on level (ft) design (ft) (m) brake reaction distance calculated (km/h) (ft) (m) (m) (ft) (m) (20) (30) (40) (50) (60) (70) (80) (90) (100) (110) (120) (130) (13.9) (20.9) (27.8) (34.8) (41.7) (48.7) (55.6) (62.6) (69.5) (76.5) (83.4) (90.4) (4.6) (10.3) (18.4) (28.7) (41.3) (56.2) (73.4) (92.9) (114.7) (138.8) (165.2) (193.8) (18.5) (31.2) (46.2) (63.5) (83.0) (104.9) (129.0) (155.5) (184.2) (215.3) (248.6) (284.2) (20) (35) (50) (65) (85) (105) (130) (160) (185) (220) (250) (285) 15 55.1 21.6 76.7 80 20 73.5 38.4 111.9 115 25 91.9 60.0 151.9 155 30 110.3 86.4 196.7 200 35 128.6 117.6 246.2 250 40 147.0 153.6 300.6 305 359.8 423.8 45 165.4 194.4…arrow_forwardThe maximum allowable speed of a car that could travel a circular curve is 74 kph. If the impact factor is 0.17, determine the degree of the circular curve. Round off to two decimal places.arrow_forwardA 2 lane highway with a grade of 6% has a posted speed limit of 50 mph and a design speed of 55mph. The minor road approach grade is -3%. Find the right turn departure sight distances for a passenger car taking a right turn from the minor road to the major road. Answer should be in feet.arrow_forward
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