Final answer:
The 'Slippery Road' sign refers to 'Slippery when wet,' and alerts drivers to potential hazards due to wet conditions on the road surface. Correct answer is option a) Slippery when wet.
Step-by-step explanation:
This sign means 'Slippery when wet'. Awareness of traffic signs is crucial for driving safety. When you see this signage, often depicted with an icon of a car with skid marks beneath, it indicates that the road may become slippery under wet conditions and that extra caution should be used when driving.
It is a warning to drivers to reduce speed and be observant of potential slippery surfaces that could cause loss of vehicle control. This sign does not indicate 'Stop sign ahead' or 'No U-turn' but rather focuses on alerting drivers about road condition that can change due to weather. So, the correct answer is option a) Slippery when wet.