Correct answer
No.
Motor vehicles must always comply with the law on the emission of smoke, polluting gases and excessive noise. This means that if a car emits more smoke than permitted from its exhaust pipe, it will be prohibited from being driven, as it will pollute excessively, and traffic officers may immobilise the vehicle if necessary.
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Yes, as long as it is driven outside a built-up area.
Yes, because the smoke is neither harmful nor polluting.
No.
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