No matter what you might think about the Mayor of London, Ken Livingstone - and the Ken-stalking neo-Nazi newspaper the Evening Standard don't think much of him - you can't fault his timing.
The IOC have sent their inspectors to London to see just how well London's decrepit public transport structure copes (we know a song about that, don't we children?), and whether it'd be up to the added stresses of millions of Olympic tourists.
Guess what, it's half-term for London's school kids, the infamous school run isn't happening and a significant number of parents are away from work loking after their children. Result, almost pain-free transport, what a coincidence that the IOC are in town...
Update: It's been pointed out to me that the Olympics would probably take place during the school summer holidays, so lighter than usual traffic might be the expected background level. However, the normal increase in tourists in London in the summer months usually takes up (and exceeds) this slack. So I think my point still stands.