Other day, pulled out from street parking in Wiley Park and turned right, just before a set of lights. Cop car in front of me decides he'll start reversing in my lane without warning, to go back and talk to a dodgy looking rider in hoodie on a babyblade. No wave to say sorry for backing me up, or for holding up traffic for 3 minutes talking to this bloke before deciding to tell him to pull over. Didn't know whether I should filter past or not, so just waited but wasn't happy. Rude pricks, at least show some sort of apology for holding up other people. Didn't even have sirens on.