If they have time to ticket then they probably, don't need the lights.
If the lights or siren are on all the time it become ineffective.
To answer you question it is basically down to whatever the law is in Poland.
Correct me if I'm wrong but in the US, they aren't supposed to pull to the side, except when blocking the only path. They consider just stopping where they are, more effective than pulling to the side. Or this was on a popular topical show, which means it could be wrong.