Automobile Engineering in ME
The main purpose of an engine's air cleaner is that it

Controls the engine's air intake volume
Prevents dust and other foreign matter from entering the engine
Prevents rain water from entering the engine
Reduces the engine's air intake noise

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Automobile Engineering in ME
The main function of the tread pattern on tyre is that

In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
The tread pattern protects the tyre's inner carcass from small stones and pieces of glass
The crests between the tread grooves absorb road noise

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