Announcements from Mr Johnson, which will start being played from today, will call on Londoners and visitors to plan their travel for the duration of the Olympic and Paralympic Games.

A typical announcement from Mr Johnson will say: “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.”

Mr Johnson is also today hosting an event for London’s business leaders to share best practice and experiences and advise those who have yet to finalise their plans that there is still time to do so.

He will be joined by Secretary of State for Transport, Justine Greening MP; London’s transport commissioner, Peter Hendy; and Seb Coe, chairman of the London Organising Committee of the Olympic and Paralympic Games (LOCOG).

A panel of London’s leading firms will share their plans for Games-time transport, from adapting restaurant booking policies to allow for customer delays, to walk and jog to work days.

Mr Johnson said: “This summer will be a hugely exciting time for London, and with a million extra visitors a day to our great city, our roads and public transport services are going to be exceptionally busy, and journeys may take longer than usual.

“So it’s vital that businesses and Londoners don’t adopt a ‘wait and see’ approach and play their part in putting on a fantastic Olympics.”

Lord Coe said: “Thousands of athletes around the world are at the final stages of planning for the Games.

“Their plans will be meticulous, leaving no stone unturned. Businesses in London also need fine tune their plans for the Games.

“There is a huge amount of information available to help people do this. It’s time to get set for a spectacular summer.”

Among those businesses who will speak at the event today are Deloitte LLP, Lloyds Banking Group, Harrods, Alliance Boots plc, Tesco, and John Lewis Partnership.