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Tyre air pressure should be checked when the tyres are cold. Driving heats the tyres and raises the pressure, so a hot reading is misleading. It should also be checked more often than once a year.
The functions of the grooves in the tyre tread, among other things:
How is braking achieved in a vehicle's braking systems?
What are the dangers of travelling in a vehicle that has a leak from the engine's exhaust system?
What must you be careful about when parking a vehicle in a closed car park?
How do we reduce the fuel consumption of the vehicle?
How can the level of air pollution from the vehicle's exhaust gases be reduced?