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Traffic-engineering Questions Set 13:

Quiz Mode

The design value of longitudinal friction is

0.20

0.15

0.35

0.60

Solution:

During the CBR test, the load sustained by a remolded penetration is 50 kg. The CBR value of the soil will be

2.4

3.6

Solution:

California Bearing Ratio (CBR) is used to

Measure soil strength

Design flexible pavement

Indicate relative strengths of paving materials

None

Solution:

While aligning a hill road with a ruling gradient of 6 %, a horizontal curve of radius 50 m is encountered. The grade compensation to be provided for this case would be

1.2%

1.5%

1.7%

1.9%

Solution:

The speed density (u-k) relationship on a single lane road with unidirectional flow is u= 70-0.7k, where u is in km/hr and k is in veh/km. The capacity of the road (in veh/hr) is

1250

1750

1568

1657

Solution:

Calculate the maximum expected flow rate on the road, if the free-flow speed on the road is 60 km/h and the jam density is 100 vehicles/km.

1300 vehicles/h

1500 vehicles/h

1700 vehicles/h

2100 vehicles/h

Solution:

On a road, the speed - density relationship of a traffic stream is given by u=70-0.7 k (where speed, u, is in km/h and density, k, is in veh/km). At the capacity condition, the average time headway will be

0.9 sec

1.0 sec

2.3 sec

5.8 sec

Solution:

A road is being designed for a speed of 110 kmph on a horizontal curve with a super elevation of 8%. If the coefficient of side friction is 0.10, the minimum radius of curve (in m) required for safe vehicular movement is

115.6m

264.3m

119.5m

528.5m

Solution:

The design speed of a two-lane two-way road is 60 km/h and the longitudinal coefficient of friction is 0.36. The reaction time of a driver is 2.5 seconds. Consider acceleration due to gravity as 9.8 m/s. The intermediate sight distance (in m, round off to the nearest integer) required for the load is

123 m

162 m

234 m

219 m

Solution:

A linear relationship is observed between speed and density on a certain section of a highway. The free flow speed is observed to be 80 kmph and the jam density is estimated as 100 vehicles per km length. Based on the above relationship, the maximum flow expected on this section and the speed at the maximum flow will respectively be

8000 vehicles per hour and 80 kmph

8000 vehicles per hour and 25 kmph

2000 vehicles per hour and 80 kmph

2000 vehicles per hour and 40 kmph

Traffic-engineering Questions Set 13:

The design value of longitudinal friction is

Solution:

During the CBR test, the load sustained by a remolded penetration is 50 kg. The CBR value of the soil will be

Solution:

California Bearing Ratio (CBR) is used to

Solution:

While aligning a hill road with a ruling gradient of 6 %, a horizontal curve of radius 50 m is encountered. The grade compensation to be provided for this case would be

Solution:

The speed density (u-k) relationship on a single lane road with unidirectional flow is u= 70-0.7k, where u is in km/hr and k is in veh/km. The capacity of the road (in veh/hr) is

Solution:

Calculate the maximum expected flow rate on the road, if the free-flow speed on the road is 60 km/h and the jam density is 100 vehicles/km.

Solution:

On a road, the speed - density relationship of a traffic stream is given by u=70-0.7 k (where speed, u, is in km/h and density, k, is in veh/km). At the capacity condition, the average time headway will be

Solution:

A road is being designed for a speed of 110 kmph on a horizontal curve with a super elevation of 8%. If the coefficient of side friction is 0.10, the minimum radius of curve (in m) required for safe vehicular movement is

Solution:

Solution:

Solution:

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