HIGHWAY NUMERICALS II

Calculate the theoretical capacity of a traffic with one way traffic flow for a stream speed of 40 kmph and average centre to centre spacing 12.8 m

• 312.5 vehicles/hour/lane

• 31.25 vehicles/hour/lane

• 3125 vehicles/hour/lane

• 3.125 vehicles/hour/lane

Calculate the equivalent radius of the resisting section of 20 cm slab, if the ratio of radius of wheel load distribution to the thickness of the slab is 2

• 20

• 35.6

• 40

• 40.9

The spot speed observations in kmph are 50,40,60,54,45,31,72,58,43,52,46,56,60,65,33. then the time mean speed in kmph is:

• 50

• 51

• 51.5

• 52

It was noted that on a section of road , the free speed was 60 kmph and the jam density was 80 vpkm. The maximum flow in vph that could be expected on this road is ?

• 800

• 1400

• 2800

• 1200

The free mean speed on a road wing is found to be 60 kmph under stopped condition the average spacing between vehicles is 6 m. The capacity of flow, assuming linear speed density relations

• 2333 veh/hr

• 3333 veh/hr

• 2500 veh/hr

• 3838 veh/hr

A moto vlogger travels 300km. If he starts at 6 am in morning and reaches 10am that time, he takes half an hour for rest, the journey speed and running speed respectively are

• 85.71kmph, 75 kmph

• 75 kmph, 85.71 kmph

• 50 kmph, 75 kmph

• 300 kmph, 200 kmph

Answer explanation

Journey speed= 300/4 =75 kmph,

Running speed = 300/ 3.5 = 85.71 kmph

While aligning a hill road with a ruling gradient of 1 in 20, a horizontal curve of radius 75 m is encountered.

• 1 in 15

• 1 in 17

• 1 in 25

• 1 in 27

Answer explanation

• Since 1 in 20 is higher than 4%

• So as per IRC, Compensation is required.

• Hence (30+75)/75 = 1.4

• and 75/75=1.0%.

• Ruling gradient = 1 in 20 = 5 %.

• Hence Compensated gradient on the curve is 4% = 1 in 25

The rate of change of centrifugal acceleration for the design speed of 84 kmph in designing transition curve is:

• 0.504

• 0.490

• 0.495
  

• 0.510

The psychological widening required on a horizontal curve of radius 235 m for a design speed of 65 km/hr is:

• 0.456 m

• 0.446 m

• 0.646 m

• 0.656 m

Determine the height of crown for SH of width 7 m with high type bituminous surface for locality having heavy rainfall? (assume straight line camber)

• 70 mm

• 50 mm

• 20 mm

• 10 mm