GATE CE Traffic Engineering PYQs & Answers — Page 3

Questions 21–30 of 44. Imported answers require independent review unless marked reviewed.

The lane configuration with lane volumes in vehicles per hour of a four-arm signalized intersection is shown in the figure. There are only two phases: the first phase is for the East-West and the West-East through movements, and the second phase is for the North-South and the South-North through movements. There are no turning movements. Assume that the saturation flow is 1800 vehicles per hour per lane for each lane and the total lost time for the first and the second phases together is 9 seconds.

Diagram for Civil Engineering question 65

The optimum cycle length (in seconds), as per the Webster’s method, is __________. (round off to the nearest integer)

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Relationship between trafic speed and density is described using a negatively sloped straight line. If

is the free-flow speed then the speed at which the maximum flow occurs is

Your answerChoose one option.

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In a three-phase signal system design for a four-leg intersection, the critical flow ratios for each phase are 0.18, 0.32, and 0.22. The total loss time in each of the phases is 2 s. As per Webster’s formula, the optimal cycle length (in s, round off to the nearest integer) is

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A signalized intersection operates in two phases. The lost time is 3 seconds per phase. The maximum ratios of approach flow to saturation flow for the two phases are 0.37 and 0.40. The optimum cycle length using the Webster’s method (in seconds, round off to one decimal place) is ______.

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On a road, the speed – density relationship of a traffic stream is given by

(where speed,

, is in km/h and density,

, is in veh/km). At the capacity condition, the average time headway will be

Your answerChoose one option.

0.5 s

1.0 s

1.6 s

2.1 s

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Spot speeds of vehicles observed at a point on a highway are 40, 55, 60, 65 and 80 km/h. The space-mean speed (in km/h, round off to two decimal places) of the observed vehicles is ________.

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The traffic starts discharging from an approach at an intersection with the signal turning green. The constant headway considered from the fourth or fifth headway position is referred to as

Your answerChoose one option.

discharge headway

effective headway

intersection headway

saturation headway

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24-h traffic count at a road section was observed to be 1000 vehicles on a Tuesday in the month of July. If daily adjustment factor for Tuesday is 1.121 and monthly adjustment factor for July is 0.913, the Annual Average Daily Traffic (in veh/day, round off to the nearest integer) is ________.

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