Final answer:
When raining, special care is needed when turning or stopping due to slippery conditions caused by oils on the road, which light rain can exacerbate. Heavy rain can wash these away but create other issues like hydroplaning. Safe driving practices, like reducing speed and using headlights, are essential.
Step-by-step explanation:
When it is raining, you should be most careful when turning or stopping because the road surface becomes slippery, increasing braking distances and reducing tire traction. During light rain, oil and gasoline that have leaked onto the road can rise to the surface, creating an especially slick layer that can cause vehicles to lose control. A heavy rain can wash away the oily layer, but it can also lead to standing water and potential hydroplaning, which requires drivers to be highly cautious when turning or stopping to maintain control of their car. Ensuring proper tire tread depth and reducing speed can help maintain control during rainy conditions. Additionally, it's important to keep a safe distance from other vehicles and to use headlights to improve visibility.