Final answer:
The road surface is most slippery in the first 30 minutes after a rain shower begins.
Explanation:
The road surface is likely to be most slippery:
- OB) in the first 30 minutes after the shower begins: During the early stages of a rain shower, the road surface accumulates oils and debris, making it extremely slippery.
- OA) an hour after the shower begins: As time passes, the rainwater washes away the initial slippery substances, improving traction.
- OC) just as the shower ends: Towards the end of the rain, the surface is less likely to be excessively wet and slippery.
- OD) uniformly for the duration of the shower: The slipperiness may vary but is typically most hazardous in the initial stages.
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