In Folkestone, which is used as a point of passage to continental Europe, Eurotunnel spokesman John Keith said many will be providing the 'advanced passenger information' at the time of booking their trip. Only 20 percent of the cars will be controlled to see if the data match those provided at the time of booking.
Eurotunnel said it had implemented new measures to keep potential disruption to its customers to a minimum.
"Our customers expect the traffic to flow from the check-in through to the train, so we've recruited new staff, we've taken on 50 new staff, we've invested something like two-and-a-half million pounds in infrastructure, in technology, in road markings, to make sure that the traffic would keep flowing no matter how heavy it gets," said Eurotunnel spokesman John Keith.
Some travellers said they didn't mind the new exit checks.
"I don't think there's a problem, it's even good. You can't go to another country without showing any I.D., so I think it's good," said one traveller.
"That's good, I'm happy with that, makes no difference to me as long as it doesn't add to the queues. Why not," said another traveller.
While no major delays or problems were reported on Wednesday, the real test to the system was yet to come, warned a travel expert.
"The pressure is really going to start building up on busy weekends in summer, when you could see cars start to back up along the M-20, which point I think they may decide to abandon exit checks temporarily," said travel journalist Simon Calder.
The M-20 motorway links London to the Channel ports of Dover and Folkestone where motor traffic can link to France via the Channel Tunnel or via ferries