BTT Speed Limits and Zones 4

Question 1

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

Accepted Answer

50 km/h

Answer

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

Question 2

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

Accepted Answer

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

Answer

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

Question 3

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

Accepted Answer

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

Answer

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.

Question 4

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

Accepted Answer

Kilometres per hour

Answer

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

Question 5

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

Accepted Answer

Because the curve radius requires a lower speed for safe negotiation

Answer

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

Singapore BTT Practice Test