Looking at rural situations where level crossings are found, would any such blockage be immediately required to be formally notified to all the emergency services, as there may not be another crossing in the area for their vehicles to use.
In a couple of cases that has happened to me.
We were renewing the track through crossings which where the sole means of access to a property and in one case to a village.
In the case of the village we had to provide a means of bridging the level crossing suitable to take the weight of a fire appliance and a parking area for residents vehicles on the accessible side of the crossing, with an escorted crossing of the excavation.
In other cases just providing a parking area for residents sufficed.
As for road closures, these are passed on to the emergency services as a matter of course.
However if they then choose to ignore them that is up to them.
2 cases I have personally seen are a squad car under "Blues and Twos" ended up in the excavation through Snaith and Pontefract LC at Hensall after driving past all the closure signs, officer said he was chasing another vehicle, no other vehicle in the hole though, did it fly across?
The second incident was when I was at Weaverthorpe crossing when a motorist asked if she could come across the crossing as she only lived a few houses up the road. I said sorry but No as she had passed at least 8 Road Closed signs, you can park up and walk over though.
She then flashed her Warrant Card not even for me?
I said even more reason for not coming across as she would have been briefed at the Police station about the closure.