I did dig out the transport documents (at the time) for the new arena plans. It was a truly pathetic report. Essentially "do nothing." I think this shows contempt for the paying customers for music events and football.
It was worse than that. It specifically made it a condition of planning permission that no car parking provision would be allowed for the arena. It wasn't just silent on the matter, it deliberately made it worse.
There is a particular lobby group who have the ears of the councils that believe if you make it hard for car drivers, they will switch to alternatives. This fails to notice that 1) they don't change behaviour and will stay in cars for longer and 2) by not putting in alternatives up front they won't actually change anything.