Final answer:
The road sign 'slower traffic keep right' means that vehicles traveling slower than the flow of traffic on a multi-lane highway must stay in the right-hand lane to allow faster traffic to pass on the left.
Step-by-step explanation:
Interpreting Traffic Signs and Road Safety
The regulatory road sign 'slower traffic keep right' indicates that slower vehicles traveling on multiple lane highways must stay in the right-hand lane. This is to facilitate smoother traffic flow and allow faster-moving vehicles to pass on the left. It does not indicate that the right-hand lane is reserved for buses and car-pool vehicles, nor does it command all vehicles to slow down and remain in the right lane regardless of their speed.
Understanding and obeying this sign is crucial for road safety and efficiency. Slower traffic should use the right lane to prevent congestion and reduce potential hazards associated with faster vehicles needing to overtake. This rule of road usage plays an important role in traffic management, especially on highways and freeways where vehicles travel at higher speeds.