Quidam: welcome.
Police are not affiliated to air ambulance. It only exists with three forces [wilts / sussex / N wales]. It's the other way round. the air ambulance aspect attaches itself to the well established police facility.
Your other point: our helo uses the tried and tested speed device: Vascar, from the rear of the cockpit. There is no other device (airborne) available. We have successfully prosecuted on a number of recent ocassions. We were on TV recently in "mean street" (BBC1 two weeks ago)demonstrating our ability to monitor and when necessary, prosecute speeding MOTORCYCLISTS. Note the latter, we have set up this procedure to try and reduce the death rate of the motorcycle fraternity. 16 died last year and so far this year 8 have died. I can guarantee you, that there is no other way we can keep track of this particular rise in road statistics. This, I'm afraid to have to tell you, is a case of high tech doing the business....
Roofus: I suspect you have/do not do HEMS, otherwise you'd appreciate what we are up against. 'Speeding motorists' as most people perceive it, does not come into it.
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Thermal runaway.