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QUESTION: 1

The mechanical extra widening required for 10.5 m wide pavement on a horizontal curve of radius R metre is given by

where l is the length of wheel base of vehicle in metres.

Solution:

Mechanical widening

where, n = no. of lanes

For 10.5 m wide pavement,

n=3

QUESTION: 2

The reaction time for calculation of stopping distance may be assumed as

Solution:

QUESTION: 3

The maximum design gradient for vertical profile of a road is

Solution:

Ruling gradient is the maximum gradient within, which the designer attempts to design the vertical profile of a road.

QUESTION: 4

On sag (or valley) curves the available sight distance is determined based on

Solution:

QUESTION: 5

The maximum; width of a vehicle as recommended by IRC is

Solution:

QUESTION: 6

Transition curves are provided on the approach to horizontal curves in order to

Solution:

QUESTION: 7

Transition curve is provided in horizontal alignment

Solution:

QUESTION: 8

The ideal form of curve for the summit curve is

Solution:

**Correct Answer :- C**

**Explanation : **Ideal curve is circular and the most preferred curve is parabola.

Many curve forms can be used with satisfactory results, the common practice has been to use parabolic curves in summit curves. This is primarily because of the ease with it can be laid out as well as allowing a comfortable transition from one gradient to another. Although a circular curve offers equal sight distance at every point on the curve, for very small deviation angles a circular curve and parabolic curves are almost congruent. Furthermore, the use of parabolic curves were found to give excellent riding comfort.

QUESTION: 9

The off-tracking of a vehicle having a wheel base of 6.0 m and negotiating a curved path of mean radius 25 m is

Solution:

QUESTION: 10

The important factor considered in the design of summit curves on highways is

Solution:

When a fast moving vehicle travels along a summit curve, the centrifugal force will act upwards, against gravity and hence a part of the pressure on the tyres and spring of the vehicle suspensions in relieved. So there is no problem of discomfort to passengers on summit curves, particularly because the deviation angles on roads are quite small. The only problem is designing summit curves is to provide adequate sight distances. The stopping sight distance or the absolute minimum sight distance should invariably be provided at all sections of the road system and so aiso on summit curves.

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