I once was pulled over by a van transporting a prisoner, it was a three lane set of lights and it merged into two, I was in the left, and took off from the lights to get in front of them, however, they sped up and beside me and signalled to pull over, and asked why i was in a hurry. I was surposed to be at my friends house 1 hour earlier, but my ex-gf kept me busy and I was late.
they checked my rego and let me drive off. Very weird for an unmarked van with a prisoner in it.