School Car Park LRM DLA

Our mainstream school will not let us use their car park because they say it is too dangerous as G is a runner.

DS dxd ASD,  delayed expressive language aged 5.

We have a letter proving that we have been awarded Lower Rate Mobility DLA. He refuses to walk or is a runner and has no sense of danger compared to a neurotypical child of the same age.

I find it significantly more dangerous being on the main road with my two children aged 5 and 6 than in their carpark.

They have said it is my problem getting them to school.

I welcome any comments. I want to send a letter to the governors but need more weight to this problem. Anything greatly appreciated.