In particular, all four routes south from the Trafalgar Square area have
been shut to cars and taxis from 6am to midnight every day, meaning
anyone trying to get from the west end to most of south London faces an
impenetrable two-mile east-west scar in London's road network from Hyde
Park Corner to the eastern end of Aldwych.

Quite a lot of this kind of stuff, to great detail, is laid down in
the T+Cs set by the IOC.

The only opportunity to argue the toss is when bidding, which is a bit
risky and not to be recommended when you are still trying to win the
bid.

Once the successful bid has been announced everything becomes
contractual and you're stuck with it.