I doubt that's true, and even if so how many miles of 70mph motorway are there and how many are there of 30mph?
How many people died on each not had an accident, you're trying to change the narrative.
How many on 70mph roads not only motorways?
You've probably thrown in the A roads and stuff with the 30mph roads.
If not you are trying to say it's safer to be hit at 70mph that 30mph.