Traffic-engineering Questions Set 9:
The design value of lateral friction coefficient of highway is
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The spot speeds (expressed in km/hr) observed at a road section are 66, 62, 45, 79, 32, 51, 56, 60, 53, and 49. The median speed (expressed in km/hr) is
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The lost time due to starting delay on a traffic signal approach is noted to be 3 sec, the actual green time is 20sec and the amber time is 3sec. How much is the effective green time?
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Temperature stresses in concrete pavements may cause the slab to crack. If a slab cools uniformly then the crack will develop at the which of the following locations of the slab?
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Given the side distance is 120 m the height of drivers eyes as 1.5 m the height of the obstacle as 15 cm the grade difference of the intersecting gradients as 0.09 the required length of the Summit parabolic curve is
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Two major roads with two lanes each are crossing in an urban areas to form an uncontrolled intersection. The number of conflict points when both roads are one way is X and when both roads are two way is Y. The ratio of X and Y is
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Calculate the safe stopping sight distance on a level road stretch for a design speed of 50 km/hr for two-way traffic on a two-lane road.
Assume the coefficient of friction as 0.37 and the driver's reaction time as 2.5 seconds.
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The stopping sight distance (SSD) of a level highway is 140 m for the design speed of 90 km/h. The acceleration due to gravity and deceleration rate are 9.81 m/s² and 3.5 m/s². respectively. The perception/reaction time (in s, round off to two decimal places) used in the SSD calculation is
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A broad-gauge railway line passes through a horizontal curved section (radius = 875 m) of length 200 m. The allowable speed on this portion is 100 km/h. For calculating the cant, consider the gauge as center-to-centre distance between the rail heads, equal to 1750mm, The maximum permissible cant (in mm, round off to I decimal place) with respect to the center-to-center distance between the rail heads is
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Design parameters for a signalized intersection are shown in the figure below. The green time calculated for major and minor roads are 34 and 18 s, respectively.
The critical lane volume on the major road changes to 440 vehicles per hour per lane and the critical lane volume on the minor road remains unchanged. The green time will
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