Chris Evans has admitted that he has been terrified of losing his driving licence since landing the Top Gear job and "never driven more carefully".
The Radio 2 breakfast show DJ said that he had spent a lot of time in his car yesterday, after his appointment was announced, driving to and from several appearances on TV and radio shows and that he was extremely careful to stick to the speed limits.
"The most striking thing about the whole day day was that I spent a lot of it my car," he told listeners.
"I have never driven more carefully. I have now realised I can't lose my licence."
"You know when you drive so tentatively you're almost a bit of a danger ... I stuck to all the speed limits," he added.
Last night Evans said that he would be holding auditions to find a co-host on the hit show.
Today he said that candidates needed to have an "appetite, hunger and need" to host the motoring show, which will be broadcast on BBC2 in March or April.
"If nobody's good, nobody is going to get the job," he said.
The broadcaster was tipped to take the driving seat on the flagship BBC show after Jeremy Clarkson was sacked for punching a producer in a row over steak.
When his appointment was announced, weeks after he ruled himself out of the running, the BBC also confirmed that James May and Richard Hammond would not be back.
He asked anyone who wants to appear on the show to make a short video, lasting no longer than 30 seconds, to post on a website.
The website address will be released tomorrow morning.
Evans said that the audition was "not a stunt" and added: "We hope that that there's going to be an amazing response to this not just in the UK but around the world."
The video should demonstrate the candidate's "relationship with cars" and successful presenters will have to know "at least as much as or more than me" about cars, he said.
The videos should feature "no stunts, no gimmicks" or cars and show the candidate from the waist up, he said.
Wannabe presenters will then be whittled down for a live audition in front of Evans and the production team.
Evans said that there will definitely be a "female presence" on the show.