What is the safe stopping distance for a section of rural freeway with a design speed of 80 mi/h and maximum coefficient of skidding (forward) friction on: b) 4% upgrade a) Level terrain
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- Highway curve with a radius of 300m is to be super elevated to accomodate a normal speed of 72 kph. Calculate the required super elevation e if the width b of the pavement is 10mSuperelevation recommended for a highway with a horizontal simple curve radius (275) m, design speed (60) km/hr. is: *A 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.
- Problem 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.2 A vehicle initially traveling at (75 mile/hr.), skids to a stop taking (170) m to do so. the coefficient of skidding resistance (0.36). What should the grade be for this roadway. (Use t = 2.5 sec.).An existing horizontal curve has a radius of 85 meters, which restricts the maximum speed on this section of road to only 60% of the design speed of the highway. Highway officials want to improve the road to eliminate this bottleneck. Assume coefficient of side friction is 0.15 and rate of superelevation is 0.08. Compute the existing speed, design speed, and find the new radius of curvature.
- A four-lane divided multilane highway (two lanes in each direction)in rolling terrain has the following additional characteristics:• BFFS of 60 mi/h (100 km/h)• No access points• 12-ft lanes (3.6m)• 8-ft (2.4m) shoulder on the right side and 6-ft (1.8m) shoulder on the left• The peak-hour factor is 0.84• The traffic stream consists of 6% trucks, 4% buses and 3% recreational vehicles.• The driver population adjustment factor is estimated at 0.90.• Analysis flow rate is 1250 pc/h/ln. i) A new urban development will be built in the proximity of this highway section. This development will require the addition of 20 access points per mile (12 access points per km) but all other conditions (geometry and traffic) will stay the same. What is the differential (change) in the average speed (S) before and after the urban development?Problem 2. inside lane of a proposed highway (horizontal curve) is 86.0 ft. The current design plan of the highway horizontal curve has a radius of 695 ft, for a level grade, with a design speed of 65 mph. Braking friction coefficient f=0.35, side friction coefficient f 0.11, superelevation rate e- 6%. Please check the design adequacy for the radius of the curve. The allowable distance from a roadside obstruction to the centerline of theA 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 ?
- 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.A 2-lane highway has lane widths of 9ft (2.75 m), with 6ft (1.83 m) clear hard shoulders. There are no-passing zones along 40% of its length. The directional split is 70/30 in favour of the peak direction. The percentages for the various heavy vehicle types are: P, - 10% P- 4% P- 2% The terrain is rolling. Calculate the service flow of the highway when running at full capacity.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.)