Global Traffic Network boss Paul Hutton's completed a 105-mile traffic-free walk for charity along the Grand Union Canal.
Along with wife Sarah, he's raised more than £3,000 for Cancer Research UK and the Make-A-Wish Foundation.
Paul and Sarah set off on the four-day trek last Thursday, straight after getting home from the Radio Festival, departing from the Watford Gap services on the M1 heading for Little Venice in London.
Paul told RadioToday.co.uk: "It seemed a good idea in July when we thought of it, but it turned out to be really tough. We were walking from dawn-to-dusk each day and by the last day we were exhausted with really sore limbs. But now we’ve done it, there’s a real sense of achievement."
The adventure – called the M1 Walk because of its original route – featured on BBC Three Counties, BBC Northampton and Mix 96 along the way.
The pair have vowed never to do anything like it again!
Visit their [link=http://www.m1walk.com]website[/link] to find out more and make a donation to the charities.