"Catalytic converters reduce a large percentage of harmful exhaust emissions. They work more efficiently when the engine has reached its normal working temperature."
Driving Theory Test is the online platform for UK drivers that want to study and pass the UK theory test on their first try. The system is designed to teach you the study material interactively. Plus, our practice questions cover all sections of the Highway Code. So, you have a comprehensive review of all the need-to-know information to sit the DVSA theory test.