Question

Which of the following is false, in comparison with roundabouts and traffic signals?

• A. The use of roundabout reduces overall travel time
• B. Traffic signals are more suited where traffic volumes are lower
• C. Traffic signals help in reducing fuel usage
• D. Roundabouts are safer for pedestrians

Hint:

Intersection Rule of Thumb: - Low to Medium Volume $\rightarrow$ Roundabouts (keeps traffic flowing naturally without stopping). - High, Intricate Volume $\rightarrow$ Traffic Signals (explicitly assigns right-of-way to prevent gridlock).

Answer 1

The Correct Option is B

Concept: Traffic engineering evaluates intersections based on safety, capacity, delay patterns, and structural volumes.
• Roundabouts work best with low-to-medium balanced traffic volumes, allowing continuous flow without forcing vehicles to stop when the intersection is empty.
• Traffic Signals are required at high-volume intersections where heavy traffic must be separated by time intervals to prevent gridlock.

Step 1: Evaluating the accuracy of Option (B).
Option (B) states that traffic signals are more suited where traffic volumes are lower. This is false because installing expensive signal infrastructure at low-volume intersections creates unnecessary delays, forcing drivers to wait at red lights even when there is no cross-traffic. Instead, low-to-medium traffic junctions are better served by unsignalized stop signs or modern roundabouts.

Step 2: Reviewing the context of the other statements.
Let us look at why the other options represent valid comparisons or arguments in traffic design:
• Travel Time & Fuel Usage: At matching low-to-medium volumes, roundabouts reduce structural delays compared to signals because vehicles do not experience fixed red-light idling. This keeps traffic moving and reduces overall fuel consumption and travel times (making statements A and C part of ongoing engineering trade-off debates).
• Safety: Modern roundabouts eliminate dangerous left-turn T-bone crashes and high-speed perpendicular collisions. They force drivers to slow down to around 25--30 km/hr, which simplifies conflict points and increases safety for pedestrians crossing the entry lanes. Consequently, statement (B) is the demonstrably false claim.