UK Driving Theory Practice Exam

Underinflated tyres are tyres that do not have enough air. When tyres are underinflated, there is increased friction between the tyres and the road, which leads to increased fuel consumption. This is because the engine has to work harder to overcome the extra resistance caused by the underinflated tyres. Additionally, underinflated tyres can affect braking by reducing the contact between the tyres and the road, making it harder for the car to stop quickly. This can be dangerous in emergency situations. While underinflated tyres may initially seem to improve vehicle handling by providing more traction, this is only temporary and can actually lead to decreased handling in the long run. Lastly, underinflated tyres can also lead to premature wear and tear, shortening their lifespan and potentially causing hazards on the road. Therefore, the correct answer is B, as underinflated tyres can negatively impact both fuel consumption and braking.