Final answer:
Roadways are most slippery after rain, snow, or sleet when the precipitation is still falling or has just stopped. It's important to note that the slipperiness of roadways can also be influenced by factors like temperature, the type of road surface, and the volume of traffic.
Step-by-step explanation:
When it rains or snows, roadways become slippery due to the presence of water on their surfaces. The friction between the tires of vehicles and the wet road is reduced, making it more difficult for the tires to maintain grip. This results in a higher chance of vehicles skidding or sliding.
After rain or snow, roadways are most slippery when the precipitation is still falling or has just stopped. During this time, the road surface is completely wet and has not had a chance to dry. Once the precipitation stops and the road begins to dry, the level of slipperiness decreases.
It's important to note that the slipperiness of roadways can also be influenced by factors like temperature, the type of road surface, and the volume of traffic. Cold temperatures can cause the water on the road to freeze, forming ice and making the surface even more slippery.