List of top Transportation Engineering Questions asked in GATE CE

The figure presents the trajectories of six vehicles within a time-space domain. The number in the parentheses represents unique identification of each vehicle.

The mean speed (in km/hr) of the vehicles in the entire time-space domain is ______ (rounded off to the nearest integer).

The number of trains and their corresponding speeds for a curved Broad Gauge section with 437 m radius, are

• 20 trains travel at a speed of 40 km/hr
• 15 trains travel at a speed of 50 km/hr
• 12 trains travel at a speed of 60 km/hr
• 8 trains travel at a speed of 70 km/hr
• 3 trains travel at a speed of 80 km/hr

If the gauge (center-to-center distance between the rail heads) is taken as 1750 mm, the required equilibrium cant (in mm) will be ______ (rounded off to the nearest integer).

The consolidated data of a spot speed study for a certain stretch of a highway is given in the table.

Speed Range (kmph)	Number of observations
0-10	7
10-20	31
20-30	76
30-40	129
40-50	104
50-60	78
60-70	29
70-80	24
80-90	13
90-100	9

The "upper speed limit" (in kmph) for the traffic sign is

A horizontal curve of radius 1080 m (with transition curves on either side) in a Broad Gauge railway track is designed and constructed for an equilibrium speed of 70 kmph. However, a few years after construction, the Railway Authorities decided to run express trains on this track. The maximum allowable cant deficiency is 10 cm.
The maximum restricted speed (in kmph) of the express trains running on this track is __________ (rounded off to the nearest integer).

Differential levelling is carried out from point P (BM: +200.000 m) to point R.
The readings taken are given in the table.

Points	Staff readings (m)		Remarks
	Back Sight	Fore Sight
P	(-)2.050		BM: +200.00 m
Q	1.050	0.950	Q is a change point
R		(-)1.655

Reduced Level (in meters) of the point R is _______ (rounded off to 3 decimal places).

A vertical summit curve on a freight corridor is formed at the intersection of two gradients, +3.0% and -5.0%.
Assume the following :
Only large-sized trucks are allowed on this corridor
Design speed = 80 kmph
Eye height of truck drivers above the road surface = 2.30 m
Height of object above the road surface for which trucks need to stop = 0.35 m
Total reaction time of the truck drivers = 2.0 s
Coefficient of longitudinal friction of the road = 0.36
Stopping sight distance gets compensated on the gradient
The design length of the summit curve (in meters) to accommodate the stopping sight distance is _______ (rounded off to 2 decimal places).

The longitudinal sections of a runway have gradients as shown in the table.

End to end for sections of runway (m)	Gradient (%)
0 to 200	+1.0
200 to 600	-1.0
600 to 1200	+0.8
1200 to 1600	+0.2
1600 to 2000	-0.5

Consider the reduced level (RL) at the starting point of the runway as 100 m.
The effective gradient of the runway is

The following data is obtained from an axle load survey at a site:
Average rear axle load = 12000 kg
Number of commercial vehicles = 800 per day
The pavement at this site would be reconstructed over a period of 5 years from the date of survey. The design life of the reconstructed pavement is 15 years. Use the standard axle load as 8160 kg and the annual average vehicle growth rate as 4.0%. Assume that Equivalent Wheel Load Factor (EWLF) and Vehicle Damage Factor (VDF) are equal.
The cumulative standard axle (in msa) for the pavement design is _____ (rounded off to 2 decimal places).

The free mean speed is 60 km/hr on a given road. The average space headway at jam density on this road is 8 m. For a linear speed-density relationship, the maximum flow (in veh/hr/lane) expected on the road is

A car is travelling at a speed of 60 km/hr on a section of a National Highway having a downward gradient of 2%. The driver of the car suddenly observes a stopped vehicle on the car path at a distance 130 m ahead, and applies brake. If the brake efficiency is 60%, coefficient of friction is 0.7, driver's reaction time is 2.5 s, and acceleration due to gravity is 9.81 m/s², the distance (in meters) required by the driver to bring the car to a safe stop lies in the range

As per the International Civil Aviation Organization (ICAO), the basic runway length is increased by x (%) for every y (m) raise in elevation from the Mean Sea Level (MSL). The values of x and y, respectively, are

Which one of the following statements related to bitumen is FALSE?