What is the fine-grained topic of the following text: Tyres have to be checked regularly because just like your pencil eraser they get worn down over time, and if the tread is worn down and the grooves aren’t as deep as they should be, it’ll be harder to stop the car quickly and will massively reduce grip on the road – especially unhelpful in rainy or snowy conditions! Only return the topic.
Importance of regular tyre checks for vehicle safety