List of top Transportation Engineering Questions

A 5.0 m wide rectangular channel carries a discharge of 10 m³/s at a depth of 1.5 m under uniform flow. To produce critical flow conditions without affecting the upstream conditions, the channel bottom elevation should be raised (in m) by ........ (rounded off to 2 decimal places).

A one-way, single lane road has traffic that consists of 30% trucks and 70% cars. The speed of trucks (in km/h) is a uniform random variable on the interval (30, 60), and the speed of cars (in km/h) is a uniform random variable on the interval (40, 80). The speed limit on the road is 50 km/h. The percentage of vehicles that exceed the speed limit is ........ (rounded off to 1 decimal place). 

The figure shows a network diagram for a construction project. The activities A, B, C, D, E, and F are represented by arrows and their durations are in the figure. The total float available for the activity E in day(s) is equal to ......... (round off to the nearest integer).
\begin{center} \includegraphics[width=10cm]{53.png} \end{center}
A reinforced concrete beam has a support section with width of 300 mm and effective depth of 500 mm. The support section is reinforced with 3 bars of 20 mm diameter at the tension side. Two-legged vertical stirrups of 10 mm diameter and Fe415 steel at a spacing of 100 mm are provided as shear reinforcement. Assume that there is no possibility of diagonal compression failure at the section.
As per IS 456:2000, the maximum shear resisted by the vertical stirrups (in kN), as per limit state design, is ......... (round off to one decimal place).
A 5.0 m wide rectangular channel carries a discharge of 10 m³/s at a depth of 1.5 m under uniform flow. To produce critical flow conditions without affecting the upstream conditions, the channel bottom elevation should be raised (in m) by ........ (rounded off to 2 decimal places).

A one-way, single lane road has traffic that consists of 30% trucks and 70% cars. The speed of trucks (in km/h) is a uniform random variable on the interval (30, 60), and the speed of cars (in km/h) is a uniform random variable on the interval (40, 80). The speed limit on the road is 50 km/h. The percentage of vehicles that exceed the speed limit is ........ (rounded off to 1 decimal place). 

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
Differential levelling is carried out from point P (BM: +200.000 m) to point R.
The readings taken are given in the table.
PointsStaff readings (m)Remarks
Back SightFore Sight
P(-)2.050 BM: +200.00 m
Q1.0500.950Q is a change point
R (-)1.655 
Reduced Level (in meters) of the point R is _______ (rounded off to 3 decimal places).
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
0-107
10-2031
20-3076
30-40129
40-50104
50-6078
60-7029
70-8024
80-9013
90-1009
The "upper speed limit" (in kmph) for the traffic sign is
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).
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).
The figure presents the trajectories of six vehicles within a time-space domain. The number in the parentheses represents unique identification of each vehicle.
trajectories of six vehicles within a time-space domain
The mean speed (in km/hr) of the vehicles in the entire time-space domain is ______ (rounded off to the nearest integer).
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
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
Which one of the following statements related to bitumen is FALSE?
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).
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

A plot of speed-density relationship (linear) of two roads (Road A and Road B) is shown in the figure. If the capacity of Road A is \(C_A\) and the capacity of Road B is \(C_B\), what is \(\frac{C_A}{C_B}\)? 

Which of the following is equal to the stopping sight distance?

The figure presents the time-space diagram for when the traffic on a highway is suddenly stopped for a certain time and then released. Which of the following statements are true? 

The vehicle count obtained in every 10 minute interval of a traffic volume survey done in peak one hour is given below. \[ \begin{array}{|c|c|} \hline \text{Time Interval (in minutes)} & \text{Vehicle Count} \\ \hline 0 - 10 & 10 \\ 10 - 20 & 11 \\ 20 - 30 & 12 \\ 30 - 40 & 15 \\ 40 - 50 & 13 \\ 50 - 60 & 11 \\ \hline \end{array} \] The peak hour factor (PHF) for 10 minute sub-interval is \(\underline{\hspace{1cm}}\) (round off to one decimal place).

Consider the four points P, Q, R, and S shown in the Greenshields fundamental speed-flow diagram. Denote their corresponding traffic densities by \( k_P \), \( k_Q \), \( k_R \), and \( k_S \), respectively. The correct order of these densities is: 
 

A two-phase signalized intersection is designed with a cycle time of 100 s. The amber and red times for each phase are 4 s and 50 s, respectively. If the total lost time per phase due to start-up and clearance is 2 s, the effective green time of each phase is \(\underline{\hspace{2cm}}\) s. (in integer)
A horizontal curve is to be designed in a region with limited space. Which of the following measure(s) can be used to decrease the radius of curvature?