On a two way traffic road, the speed of overtaking and overtaken vehicles are 100kmph 50kmph respectively. If the average acceleration is 0.92 m/s². Determine the overtaking sight distance. Draw a neat-sketch of the overtaking zone.
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- Because 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 limitThe stopping sight distance on a curved section of a road is 500 ft. The superelevation of the curve is 4.5%. The current radius of the curve is 900 ft. What should be the design speed on the curve? Use AASHTO tablesA 5˚ curve (measured at the centerline of the inside lane) is being designed for a highway with a design speed of 65 mi/h. The curve is on a 2% upgrade, and driver reaction time may be taken as 2.5 seconds. What is the closest any roadside object may be placed to the centerline of the inside lane of the roadway while maintaining adequate stopping sight distance?
- For the Greenshields model, the mean free flow speed on a highway facility lane equals 75 mph near zero density, and the jam density is observed to be about 160 veh/mi. Plot the q-k-u curves in proper order. Write down the speed-density, flow-speed, and flow-density equations. Find out the maximum flow, and also mark it on your diagrams. Compute speeds and densities corresponding to a flow of 2,880 veh/h, describing traffic conditions from a driver’s point of view. Calculate average headways, gaps, clearance, and spacing at CASE 1: maximum flow and at CASE 2: jam density. (Suppose the average vehicle length is 17ft)A car travels at a costants speed of 100kph when its initial position is 400m measured horizontally and whose vertical terrain is given by the equation y=0.0003x^2. (A) Compute the radius of curvature at its initial position. (B) Find the total acceleration of the car if the position of the car is 200m from its initial positionDetermine the maximum speed in kph that a car could move around havng a radius of 500m if the impac factor of that curve is 0.15. Neglect friction between the tires and pavement. Express in 2 decimal places.
- Determine the approximate center to center spacing of vehicles in a certain lane if the average speed of the cars using that particular lane is 40 kph and the volume of traffic is 800 vphA traffic stream in a particular direction ofa two lane road is moving with a constantspeed of 50 kmph, with an average headway of 2.52 seconds. Find the longitudinal distance between two consecutive vehicles.The design speed on a BG track for a circular curve with transitions is 96 km/h. Determine the length of transition. Assume suitable values for the other data required to solve the problem.