Speed Limits and Zones Flashcards

What is the typical speed limit on single carriageway roads in Singapore?

Answer: 50 km/h

The typical speed limit on single carriageway roads in Singapore is 50 km/h unless otherwise indicated by signs.

On a road signed at 70 km/h, what speed should you adopt in heavy rain?

Answer: 50-60 km/h, depending on visibility and road conditions

In heavy rain, reduce speed well below the posted limit. Visibility is reduced and braking distances increase significantly on wet roads.

What is 'aquaplaning' and at what speed does it typically begin to occur?

Answer: Loss of tyre contact with the road due to water — can occur from about 80 km/h

Aquaplaning occurs when a layer of water builds between the tyre and road, causing loss of grip. It can begin at about 80 km/h on wet roads.

A speed limit sign shows '50' inside a red circle. What unit is the speed measured in?

Answer: Kilometres per hour

In Singapore, all speed limits are in kilometres per hour (km/h).

Why do expressway on-ramps sometimes have lower speed advisory signs?

Answer: Because the curve radius requires a lower speed for safe negotiation

Advisory speed signs on curves and ramps indicate the safe speed for that curve's radius. Exceeding this speed risks loss of control.

What is the relationship between speed and kinetic energy?

Answer: Kinetic energy quadruples when speed doubles

Kinetic energy increases with the square of speed. Doubling your speed quadruples your kinetic energy, meaning crash severity increases dramatically.