Under which of the following conditions is the road likely to be most slippery?

The condition in which the road is likely to be most slippery is shortly after it begins to rain or following a light drizzle. This is primarily because, in the initial moments of rainfall, water mixes with accumulated oils, dust, and debris on the roadway, creating a slick surface. The oils can form a thin, hazardous layer on top of the water, significantly reducing tire traction.

As the rain continues for an extended period, the oils and contaminants are gradually washed away, reducing slipperiness. Therefore, conditions become less hazardous after rain has been ongoing for some time.

In regards to new roads or recently painted lane markings, while they can pose dangers due to smooth surfaces or the presence of wet paint, they do not have the same immediate risk of slipperiness as the initial rain scenario. Understanding these dynamics is crucial for maintaining safety while driving in varying weather conditions.