D50 QUIZ OF THE DAY

What is the ideal transition curve type recommended for hilly roads?

• Clothoid
• Cubic parabola
• Lemniscate
• Spiral

Answer explanation

Spiral transition curves are preferred in hilly terrains due to better vehicle control.

Why is rectangular drain construction often avoided in rural roads?

• Poor structural strength
• Difficulty in construction and sedimentation risk
• Excessive space requirement
• Insufficient hydraulic radius

Answer explanation

Rectangular drains are harder to construct and face deposition problems at low flow depths.

How does transition curve affect steering operation in vehicles?

• Increases steering jerk
• Reduces driver alertness
• Provides gradual steering change
• Improves wheel camber

Answer explanation

Transition curves enable progressive curvature, ensuring smooth steering and maneuverability.

In which scenario is psychological widening most important?

• Highway intersections
• Straight stretches
• Narrow village roads
• Sharp horizontal curves

Answer explanation

Psychological widening is critical on curves where drivers need extra lateral clearance.

What is the correct formula for shift in transition curve design?

• S = l² / 2R
• S = Ls² / 24R
• S = V / 9.5R
• S = nl² / 2R

Answer explanation

Shift in transition curves is calculated using S = Ls² / 24R for horizontal alignment adjustments.

Why are culverts considered more efficient than minor bridges in road drainage?

• They support wider traffic lanes
• They allow floating debris
• They are hydraulically efficient and cost-effective
• They are designed for aesthetic needs

Answer explanation

Culverts discharge more water per span and are less expensive than minor bridges.

In summit curves, what is the main comfort criteria for the driver?

• Superelevation transition
• Smooth lateral movement
• Adequate sight distance
• Constant steering

Answer explanation

Summit curves ensure drivers can see far enough ahead to react safely.

Which drainage structure is required where surface runoff is intercepted above the hill road?

• Catch water drain
• Subsurface trench
• U-shaped drain
• Side ditch

Answer explanation

Catch water drains prevent hillside runoff from entering the roadway, especially during rain.

Which type of surface drain is preferred for small streets and low discharge?

• Rectangular drain
• Semicircular drain
• V-shaped drain
• Trapezoidal drain

Answer explanation

Semicircular drains are suitable for small streets and low discharge due to their shape and material.

What is the main advantage of a 'V' shaped surface drain?

• Easy to construct
• Low cost
• Good hydraulic properties
• Wide base

Answer explanation

'V' shaped surface drains offer better hydraulic properties and velocity.