1. Compute the minimum length of guardrail required to shield a hazard located 25 ft from the pavement edge of a one-way facility. The guardrail is to be located 12 ft from the pave- ment edge. Assume that vehicles will encroach at an angle of 11° to the pavement edge. If the roadway has two-way operation, what mininmum length of guardrail will be required?

1. Compute the minimum length of guardrail required to shield a hazard located 25 ft from the pavement edge of a one-way facility. The guardrail is to be located 12 ft from the pave- ment edge. Assume that vehicles will encroach at an angle of 11° to the pavement edge. If the roadway has two-way operation, what mininmum length of guardrail will be required?

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 19P

See similar textbooks

Similar questions

How many methods are there to distribute e and fs? What is different about each method? How long is a WB-67 and what is the min distance from the left wheel path to edge of pavement to assume no off tracking? What is the most common reason for bridge failures according to NDDOT Hydraulics Section
4. 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 90 115 140 165 195 220 245 285 325 365 405 445 485
3-19 The radius of a horizontal curve on an existing highway was field-measured to be 243 m. The pavement on this two-lane highway is 6.6 m wide, and the elevation difference between the inside and outside of the curve is 0.43 m. The posted speed limit on the road is 96 km/h. Is this a hazardous location? If so, why? What action will you recommend to correct the situation?
What 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.
The radius of a horizontal curve on an existing highway is 230 m. The superelevation rate at the curve is 0.08, and the posted speed limit on the road is 100 km/h. Justify that this is a hazardous location Provide any two (2) possible actions that you would recommend to correct the situation i. ii.
A developer has requested permission to build a large retail store at a location adjacent to the intersection of an undivided four-lane major road and a two-lane minor road. Traffic on the minor road is controlled by a stop sign. The speed limits are 35 and 50 mph, respectively. The building is to be located at a distance of 65 ft from the near lane of one of the approaches of the minor road. Determine where the building should be located relative to the centerline of the outside lane of the major road in order to provide adequate sight distance for a driver on the minor road to turn right onto the major road after stopping at the stop line. Design vehicle is a single-unit truck. Lanes on both roadways are 12 ft wide. Grades are approximately level.
A new four lane divided highway is to be constructed on a subgrade of CBR 1.8%. The ADT of commercial truck traffic based on the last count was 8000 (in both the directions). The directional split of traffic is 65:35. Vehicle Damage Factor (VDF) based on axle load survey was 3.0. The pavement section is to be designed for a life span of 15 years. The last traffic count was taken 1 year back and the project would be completed in 2 years from now. The growth rate of traffic = 8%. The design cumulative standard axles on the road will be equal to
A two-lane major road with 40 mph east west direction crosses a two-lane minor road with 30 mph at a 90- degree angle. The Intersection is uncontrolled. A proposal is being made to construct a building at the south-east corner of the intersection. If the building is placed 41 feet from the center of the approach lane (nearest lane to the building) on minor road, what distagce the building should be constructed from the edge of the travel way on major road to satisty sight distance requirements. Alsume each lane is 12 feet.
A six lane highway (three 12-ft lanes in cach direction) has a superelevation of 6%, and a design speed of 60 mph. a) What radius should be used for the design of the roadway? b) If an obstruction is 12ft from the roadway edge, what SSD is available? c) Is there enough SSD available? If not, what should it be? Answer 10a: Answer 10b: Answer 10c:
Find the grade resistance, to the nearest ten pounds, for a 2400-lb car traveling on a -2.4° downhill grade.
1. Two low-volume two-lane streets (lane width = 11 ft) intersect in an urban residential area at 120-60 degree-angle. Recommend appropriate curb configurations for this intersection based on AASHTO (2011) recommendations for a passenger car design vehicle. Draw a neat sketch for the intersection showing the dimensions of all elements you selected in your design.
RING 1 RING 2 $1 2 DJL $5 MAJOR STREET lead-lag lag-lag none $2 $6 BARRIER = Phase Number = Protected Movement $3 MINOR STREET $4 = Permitted Movement = Pedestrian Movement In this ring and barrier diagram, what sequencing is used for the protected left turns? O lead-lead BARRIER