Call me thick if you like and I'm not wanting to cause trouble, but, in theory, when a train is approaching a level crossing, the barriers will be down and (if the road traffic are obeying the highway code etc) the traffic will be at a standstill, so how could they be distracted from the process of navigating the Queen's highway?
I take your point entirely! However, some crossings do not have barriers and some do not even have warning lights. Imagine if a motorist thought "Oh, it's a blue light, it must be an ambulance in the distance" and collided with a maintenance train. Yes, they should have phoned the crossing operator, but some people behave differently from the rules...
Alternatively, imagine the consequences if a driver was distracted by a blue light behind them - but on a railway that's running parallel to the road - let's say at night, in the rain. The consequences of someone pulling over from a relatively high speed to let an "emergency vehicle" pass and then confusing half a dozen motorists behind them does not make for a good result.
Admittedly the second point above is drifting rather far from discussing whether or not the RVLR applies but the crime could actually amount to manslaughter if a relevant distraction was deliberately caused and resulted in the death of a distracted motorist.
And that in itself is quite a long way from the point in general!
Are there not any road rail vehicles such as a landrover that would be quieter and quicker to run and stop?
Good point. In all seriousness, you could make a suggestion to the relevant branch of the BTP.
or is the braking on a empty stock enough.
The train goes quite slowly, judging by the video, or, indeed, as you imply, how would they spot anything and react in time?