It's the 67th annual Glasgow Taxi Outing for children with special needs.
And they will be heading to Troon, Ayrshire, in a convoy of cabs decorated in balloons and with cabbies in fancy dress.
The tradition was started in 1945 and during the past 10 years Glasgow Taxis has raised more than £63,000 for Glasgow Taxi Outing Fund.
Last year's outing saw drivers dressed as cowboys, Indians, dogs and cats.
Youngsters will be waved off at 10.45am from Kelvin Way in the West End by former Celtic captain Tom Boyd and Lord Provost Sadie Docherty.
Around 150 drivers will take pupils from the city's ASL schools, including St Kevin's Primary, Sighthill.
Youngsters there won a behind the scenes tour of Glasgow Airport after last year's taxi fund and they are looking forward to taking part again today.
Over the past six decades, thousands of taxi drivers have gone to great lengths to ensure the Outing Fund is always a huge success.
Organisers have asked sponsors, supporters and the public to back the outing. They said the trips can happen only with help from local people.