Coming into work this morning, doing my usual "make net progress above average traffic speed" along the 80 limited Great Eastern Highway through Perth's Hills, when I came up behind a late model Commodore in the outside lane. He indicates and moves to the left and I prepare to do my usual burst to minimise the time I'm alongside him, when my spidey sense tells me "Hmmm. Late model Aussie sedan, doing speed limit and exhibiting good lane discipline. Maybe we'll just tuck in behind him and observe". So I move left as well. Aerial count shows three little antennae on the back window and a glance through the car reveals an unidentified hump in the middle of the dash. Still, could just be GPS and a satphone in addition to a normal mobile maybe. Car is blowing condensation from the exhausts which makes me think it's only just started from cold, which indicates a civilian who's just left their driveway and so might just be taking it easy until their engine warms up. A couple of cars go past in the outside lane, doing the 10-15 over that's normal for that stretch of road. No immediate interest from the threat vehicle, but then his speed drifts up a bit. Still might just be Joe Public waking up. Then, just as I've decided I'm being paranoid and I'll ease past at the next opportunity, the disco lights come on and one of the cars that went past us gets pulled. I award myself 7/10 for observational skills and continue on to work in a warm glow of self-satisfaction. Mind you, it's a bit of a sad reflection on the standard of driving in WA that the thing that really rang the alarm bells in my head was the fact that the Keep Left Rule was being followed properly.