Guidance summary
Keep exhaust emissions within limits
This reviewed summary is linked to the question. It does not change the saved answer or score.
Read the reviewed summary
The exhaust system must work properly and emissions must not exceed the prescribed limits. Emissions testing checks this pollution-control requirement; it is not a test of acceleration or noise alone.
Source: Keep exhaust emissions within limits
This reviewed summary is available here without another request. The full source opens in a new tab and needs a connection.