Safety campaigner David Burbridge, who had fought hard to get something done to improve the junction, where his daughter Amanda was killed in a car crash on Valentine's Day five years ago, said he'd heard no negative comments so far.

He was furious when Cambridgeshire County Council announced earlier this year they were going back on a promise to provide a roundabout at the junction, and joined with the Citizen to campaign for the authority to keep its promise.

However, the £500,000 lights scheme got the go-ahead and they have now been in operation for nearly two weeks.

Fears the lights would cause tailbacks and traffic hold-ups appear to so far have been unfounded, with drivers in all directions suffering only minimal stoppage times.

But Mr Burbridge, of Henson Road, March, said he was still a little concerned about the safety of drivers using the nearby Hobbs Lot junction, which has not been integrated into the new scheme.

And he said it was still too early to give a proper verdict on the success of the lights.

"If it was a school report, it would read: 'So far so good, and keep up the good work'. But it is too soon to judge any possible unreliability of the lights and what affect that might have.

"We really want to see them in action for about 12 months before we give a proper verdict. But if they prove reliable, and the traffic continues to flow then I will be the first to put my hands up and apologise and say I was wrong," said Mr Burbridge, who had raised a number of concerns about swapping a roundabout for the traffic lights.

Experts described the lights as 'intelligent' as they monitor queue lengths, ensuring a maximum peak time wait of 15 seconds on the A141 legs and 30 seconds on the A605.

That equates to a maximum average queue of around nine cars on the A141 legs or four vehicles on the A605. During off peak there will be less traffic and the junction is expected to flow freely with minimal queuing.

Prior to the lights investigations showed queues of over 21 vehicles on the A605 at peak times.