On: Amsterdam to use “noise cameras” against too loud cars

[HPsquared]

That's great. They need to make "smell cameras" too to catch people who remove their catalytic converters and DPFs. In my experience a LOT of taxis seem to have their emissions systems disabled.

[j-a-a-p → HPsquared]

Perhaps a bit difficult to implement. Why not let these cars be checked with an exhaust test every year? That is common in NL and DE at least.

[HPsquared → j-a-a-p]

Evidently a lot of people cheat the system somehow.

[porkbeer → HPsquared]

Those exist and are used on freeway onramps frequently.