Highway Geometric Design · Transportation Engineering · GATE CE
Marks 1
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
In general, the outer edge is raised above the inner edge in horizontal curves for
As per the International Civil Aviation Organization (ICAO), the basic runway length is increased by $x$ (%) for every $y$ (m) rise in elevation from the Mean Sea Level (MSL). The values of $x$ and $y$, respectively, are
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?
Marks 2
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).
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 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
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 figure presents the trajectories of six vehicles within a time-space domain. The number in the parentheses represents a 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).
A bird is resting on a point P at a height of 8 m above the Mean Sea Level (MSL). Upon hearing a loud noise, the bird flies parallel to the ground surface and reaches a point Q which is located at a height of 3 m above MSL. The ground surface has a falling gradient of 1 in 2. Ignoring the effects of curvature and refraction, the horizontal distance (in meters) between points P and Q is _______________ (in integer).
A parabolic vertical crest curve connects two road segments with grades +1.0% and $$-$$2.0%. If a 200 m stopping sight distance is needed for a driver at a height of 1.2 m to avoid an obstacle of height 0.15 m, then the minimum curve length should be _________ m. (round off to the nearest integer)