Final answer:
The sign 'slower traffic keep right' instructs drivers who are moving slower than the flow of traffic to stay on the right side of the road, allowing faster vehicles to pass on the left.
Step-by-step explanation:
The white rectangle sign stating "slower traffic keep right" is a traffic management sign intended to maintain an efficient flow of vehicles on multi-lane roads. It implies that drivers going slower than the general speed of traffic should stay on the right side of the road to allow faster vehicles to pass on the left. Therefore, the correct interpretation of this sign is: 1) Drivers should slow down and keep to the right side of the road.
This rule helps reduce traffic congestion and lowers the risk of accidents by maintaining an orderly pattern of traffic movement. The left lane is generally reserved for passing or for faster-moving traffic. This system also enhances pedestrian safety by reducing the likelihood of accidents and the need to dodge traffic when crossing the road.