Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 7, Problem 10P
To determine
Largest design vehicle that can be accommodated at the intersection.Improvements to recommend if this type of movement accommodate a
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BFS in an eight-lane freeway has two interchanges in six miles along level terrain. The lane width is 11-ft. The left shoulder is 5.0 ft. The right shoulder width is also 5.0 ft. The traffic volume in the analysis period is 3225 veh/h which consists of 14% heavy trucks. Assume PHF is 0.926. What is the LOS? To increase the FFS, the engineer decided to redraw the pavement marking to create four 12-ft lane per direction, with no left shoulder and a 6.0 ft right shoulder. What is the new FFS
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Chapter 7 Solutions
Traffic and Highway Engineering
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- A local street named Dysc Drive has a series of intersections controlled by four-way stop signs (because of sight problems, perhaps). The next intersection is controlled by a stop sign on Dysc Drive but no signs on the cross street (because it has the right-of-way). Discuss the safety aspects of this design, putting yourself in the place of a driver proceeding along Dysc Drive in this direction.arrow_forwardA one lane loop ramp at the northwest quadrant of an interchange, this loop ramp is for northbound vehicles to change travel directions towards the west. The friction factor between the tire and the pavement is 0.095. If the design speed is 35 mph and the radius of the loop ramp is 545 ft measured to the centerline What should be the super elevation ?arrow_forwardWhat super-elevation rate would you recommend for a roadway with a design speed of 110 kph and a radius of 1400 ft? Assume f=0.11.arrow_forward
- The 4 northbound lanes of a rural freeway segment have 13 ft lane widths. There is no lateral clearance afforded on either side of the road. There are no ramps within the area of influence. What is the estimated FFS (mph)? Provide your answer to the nearest tenths.arrow_forwardDuring the peak hour on a Class Il two-lane highway in 5% grade terrain, volumes northbound are 1200 veh/h and volumes southbound are 400 veh/h. The PHF is 0.95, and there are 10% trucks/buses and 7% RVs. Lane widths are 12 ft, and shoulder widths are 4 ft. The roadway section is 5 mi in length, and there are 8 access points per mi. There are 50% no-passing zones and the base free-flow speed is 65 mi/h. Compute PTSF and ATS in both directions.arrow_forwardA local street named Dysc Drive has a series of intersections controlled by four-way stop signs (because of sight distance problems, perhaps). The next intersection is controlled by a stop sign on Dysc Drive but no signs on the cross street (because it has the right-of-way). Discuss the safety aspects of this design, putting yourself in the place of a driver proceeding along Dysc Drive in this direction.arrow_forward
- the proper selection of lane with will provide O none of these safety O economical solution O reduce traffic jamarrow_forwardCompare and contrast diamond, trumpet, single point diamond, cloverleaf interchanges. Include a discussion of advantages and disadvantages of each.arrow_forward4. A tall building is located 60 ft from the centerline of the right lane of a local road and 40 ft from the centerline of the right lane of an intersecting lane. The maximum speed at the intersecting road is 60 mph. Assume level grade. a. What should be the speed limit on the local road such that the minimum sight distance is provided to avoid any imminent collisions? b. If the minimum distance is not available, what would be your recommendation for safe operation? Table 1: Suggested lengths of Sight-Triangle for Right-turn cases Design Speed (mi/h) 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Length of Leg (ft) 70 90 115 140 165 195 220 245 285 325 365 405 445 485arrow_forward
- During the peak hour on a Class I two-lane highway in rolling terrain, volume northbound(peak direction) are 1300 veh/h and volume southbound are 500 veh/h. The PHF is 0.90, and there are 15% trucks/buses of which 14% are semi-trailers and 5% RVs. Lane widths are 11 ft, and shoulder widths are 4 ft. The roadway section is 5 mi in length, and there are 18 access points per mile. There are 50% no-passing zones and the free-flow speed is 65 mi/h. Determine the PTSF and ATS if the grade in the peak direction is 4.75% upgrade and if it is 4.75% down grade. The difference between free-flow speed and crawl speed is 25 mi/h.arrow_forwardQUESTION 8 The 3 eastbound lanes of a rural freeway segment have 11 ft lane widths. There is a 3 ft lateral clearance on the right side of the road. There are no ramps within the influence area. What is the estimated FFS (mph)? Provide your answer to the nearest tenths.arrow_forwardA level, rural, two-lane highway has a 10-degree curved section as it passes by a large build- ing. The obstructing corner of the building is 24.5 ft away from the center line of the highway. (a) If the lanes of the highway are 11 ft wide, what is the stopping sight distance on this section? (b) What is the safe operating speed on the section in case the corner is only 17 ft away from the center line of the highway?arrow_forward
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