Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 3, Problem 19P
To determine
Whether the designed location is hazardous or not. And action recommended for hazardous location.
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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?
On a proposed highway, the speed limit is 120 km/hr, radius of a horizontal curve on this proposed highway is 250 m and the superelevetion is 8%. Is there any design problem? If so, what the action will you recommend to correct the design?
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.
Chapter 3 Solutions
Traffic and Highway Engineering
Knowledge Booster
Similar questions
- 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 FFSarrow_forwardThe 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_forwardAn eight-lane freeway section is designed to have a lane width of 12 ft, right-side shoulder width is 3 ft, and 3 ramps over a 2-mile-long centerline. What is the free-flow speed for this freeway section? a. 75 mph b. 70 mph 65 mph O d. 60 mph C.arrow_forward
- As SR361 enters Middletown from the NW, it must curve to the south between two historic buildings. At this point, SR361 consists of two 11-foot lane. The building to the right of traffic, is only 10 feet from the edge of the 5-foot wide shoulder. Local policy is that the superelevation rates not exceed 0.06 inches per inch. Will the minimum SSD be available from vehicles moving at 60 mph through this curve?arrow_forwardA two-lane national highway passing through rolling terrain has horizontal curve of 450 m radius. Assuming design speed of 90 kmph, pavement width of 7 m, with a wheel base of 6.1 m, determine extra width of the pavement required for this curve. Assume other parameters as per relevant IRC recommendations.arrow_forwardA new transportation engineer is charged with the design of a horizontal curve a certain highway. His final design calls for a curve with a radius of 520 meters. Assume that the design speed for the highway is 110 km/h. Is the design curve acceptable? Consider super elevation of 8% and a maximum side friction factor of 0.1.arrow_forward
- A 3.25-mile segment of undivided, four-lane highway is primarily on level terrain. The highway segment does, however, contain one sustained grade of 2.5% that is 3,200 ft long. Other relevant information include: Base free-flow speed = 65 mph %3! 11-ft lanes • 4 ft clearance at the roadside (right side) • 20 access points/mile Peak-hour volume = 1,900 veh/h 13% trucks; 2% RVs • PHF = 0.90 • Familiar facility users At what LOS is the highway expected to operate? (Hint: Three different analyses will be needed: a) the level terrain portion of the highway, b) the 2.5% upgrade portion of the highway, and c) the 2.5% downgrade portion of the highway.)arrow_forward3. A developer has applied for a construction permit for a building at the southeast corner of an intersection. The intersection is controlled with a stop sign on the minor road. The four-lane major road in the east-west direction has a design speed of 50 mph. The two-lane minor road is controlled by a stop sign. Determine whether the permit should be approved for the following conditions. a. Design vehicle - Single-Unit truck b. Approach grade = 4% C. Maximum feasible distance of the building from the center of the nearest lane of the four-lane road = 21 ft d. Maximum feasible distance of the building from the center of the nearest lane of the two-lane road = 15 ftarrow_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_forward
- During the peak hour on a Class I two-lane highway, volumes northbound are 1200 veh/h and volumes southbound are 400 veh/h. The PHF is 0.95, and there are 14% trucks/ buses and 4% RVs. Lane widths are 3.35-m, and shoulder widths are 1.2-m. The roadway section is 8-km in length, and there are 12 access points per mi. There are 50% no-passing zones and the base free-flow speed is 96 km/h. Determine the base percent time following in the direction analyzed in percent. Assume Level terrain.arrow_forwardProblem 3: Highway segment is going under planning review. Given the following facts: Lane Width = 3.4 m Number of Lanes (N) - 2 (in cach direction) Total Lateral Clearance = 3.0 m Median No Median The 85th % Speed was found to be 100 km/hr (i.e. BFFS = 100 km/hr) PHF - 0.83 Terrain Type: Rolling You are asked to: A. Determine the maximum peak-hour volume that the segment can serve at a LOS C. B. Make suggestions on how to increase the total capacity while maintaining the LOS at C without major investments.arrow_forwardIf a four legged roundabout has 8 conflict points, how many does a 3 legged roundabout? From Highway Engineeringarrow_forward
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