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I noticed in my rear view today a car, BMW, white. I thought it could be a police car because 90% of their unmarked traffic cars are BMWs and the guy appeared to have some kind of high vis on. The only thing I might have been doing wrong was 50 in a 40 (approaching an NSL). It stayed behind me for a while but then it lost me in traffic. Wasn't sure if it was a police car as the reg area code isn't one used by the local force but then I found out their traffic cars use area codes from all over which makes sense. Feel like only other explanation might be it wasn't a police car but there's a big road construction site nearby and it could be someone from that? Or maybe I just didn't offend them enough.