Final answer:
Highways become more slippery under certain conditions, such as rain, ice or snow, and spills of slippery substances. These conditions decrease the friction between the tires and the road surface, increasing the risk of accidents.
Step-by-step explanation:
Highways become more slippery under certain conditions, such as:
- When it is raining, water on the road reduces the friction between the tires and the road surface, making it more slippery.
- When there is ice or snow on the road, the lack of traction between the tires and the icy surface makes it difficult to control the vehicle.
- When there is oil or other slippery substances spilled on the road, it reduces the grip between the tires and the road, making it slippery.
In all these cases, the decreased friction between the tires and the road surface leads to reduced control and increased risk of accidents.