What effect does incorrect tyre pressure have?

You answered correctly. Incorrect tyre pressure can make your car less stable when driving and cause the tyres to wear out faster. Too low or too high pressure affects how well your tyres grip the road and how evenly they touch the surface, leading to instability and quicker wear. Reaction time, however, is not affected directly by tyre pressure; it depends on the driver, not the tyres. It’s important to regularly check and adjust tyre pressure to ensure your car remains safe and your tyres last longer. Understanding this will help you answer similar questions in the future.