[Mart1000]

No police drivers response drivers do not need blue lights and sirens to use their speed exemption.

He could have been driving like that for any number of reasons. Was there a Krispy Kreme shop nearby?

The main reason for doing big speed on a m/way without blues on, is when either an un marked car or anpr etc pick up a vehicle that's stolen or the driver is wanted etc etc. chances are this Beemer was trying to get up behind it quick but without advertising 3 miles away that he's on approach. It's a juggling act to show out or not. But at night, with reduced traffic, it's not much of a problem. In built up traffic things maybe different, it's just a judgement call.