It's just a trauma response, his father was killed by a drunk driver, so now, instead of dealing with it, he's channeled his grief into this pretend police officer persona.
He is a private care worker for a family, so not even involved in the legal profession.
He does some "useful" interventions, stopping drivers cutting through junctions , but the mobile phone thing is just stupid.
I have fuck off big screen in my Tesla, and I can sit in traffic all day long tapping away like a teenager on Ritalin, that's fine! But if I so much as glance at another screen in my hand, suddenly I'm Mikey's worst enemy.
If he wants to be a Police Officer he should apply and see if he has what it takes to pass recruitment, but a grown man, pretending to be one, is mildly pathetic.