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3 July 2012, 11:37 | Updated: 3 July 2012, 11:40
You can now hear Boris Johnson's voice on the tube.
He's recorded messages to be played out on the London Underground and other forms of public transport, urging Londoners to plan their travel during the Olympic Games.
One of the messages is: "Hi folks. This is the Mayor here. This is the greatest moment in the life of London for 50 years.
"We're welcoming more than a million people a day to our city and there is going to be huge pressure on the transport network. Don't get caught out. Get online and plan your journey at GetAheadoftheGames.com."
The messages come as the Mayor encourages London's business leaders to finalise their Games-time plans and to communicate them to staff.
He says on busy days it might be better for workers to work from home, but it's not an excuse to pull an Olympic sickie.