UK Driving Theory Practice Exam

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Why shouldn't you use rear fog lights when not necessary?

To save your vehicle's battery
Because it's illegal
They will make brake lights less visible and dazzle following drivers
Rear fog lights are meant for trucks only

The correct answer is: They will make brake lights less visible and dazzle following drivers

Rear fog lights should only be used when necessary, as they can make brake lights less visible and potentially blind or distract following drivers. Using them unnecessarily can create a hazardous situation on the road. While it is important to save your vehicle's battery, using rear fog lights for this reason is not the main concern. Additionally, while it may be illegal to use rear fog lights in certain situations, this is not the main reason why they shouldn't be used when not necessary. Finally, while rear fog lights are commonly found on trucks, they are not exclusively meant for trucks and should be used appropriately by all drivers.