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Civil EngineeringWBPSC AE · SSC JE · RRB JE

Transportation Engineering— Important Topics, Formulas & MCQs

Transportation Engineering covers highway, railway, airport and traffic engineering — geometric design, pavement design, materials and traffic analysis. Highway geometric design and pavement materials are the most frequently tested areas.

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Important topics in Transportation Engineering

Highway geometric design — camber, super-elevation, sight distance
Horizontal & vertical curves, transition curves
Pavement design — flexible & rigid
Pavement materials — bitumen, aggregates, Marshall test
Highway materials testing
Traffic engineering — volume, PCU, intersections
Railway engineering — gauge, rails, sleepers
Points & crossings
Airport engineering basics
Highway drainage
Must-know

Key concepts & formulas — Transportation Engineering

Super-elevation

e + f = V²/(127R). Provided to counter centrifugal force on horizontal curves.

Transition curve length

By rate of change of radial acceleration: L = V³/(CR), where C is the allowable jerk.

PCU value

Passenger car is the reference unit, PCU = 1.0; heavier vehicles have higher PCU.

Camber purpose

Provided for drainage of surface water off the carriageway.

Exam relevance

7–9 questions in AE/JE papers and a dedicated Geometric Design (IRC) series on ScoreCardAI.

Study tip

Geometric-design formulae (SSD, super-elevation, transition length) repeat every year — make a one-page formula sheet.

Worked example

Sample Transportation Engineering MCQ

As per IRC, the super-elevation for a highway carrying mixed traffic is designed for a speed equal to:

A. The full design speed
B. 0.75 times the design speed
C. 1.25 times the design speed
D. 0.5 times the design speed
Answer: B. IRC recommends designing super-elevation for 75% of the design speed (e = (0.75V)²/127R) so that slow-moving mixed traffic is not over-superelevated.

Common mistakes to avoid

Forgetting the 0.75V rule — super-elevation is not designed for the full design speed.
Mixing up SSD (stopping sight distance) with OSD (overtaking sight distance) formulae.
PCU values — a car = 1.0, but trucks/buses are higher; don't assume all vehicles are 1.
Camber is provided for drainage, not to counter centrifugal force (that is super-elevation).
Keep going

Related Civil Engineering subjects

Strength of Materials
RCC
Steel Structures
Soil Mechanics
Foundation Engineering
Surveying
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