Extra signs may have to be put up at Oxford’s new hamburger roundabout after concerns that drivers were getting confused.

Work has just finished on £2m of improvements to the Heyford Hill roundabout, which was paid for by Sainsbury’s as part of an extension to its neighbouring store.

The aim was to improve access to the store and cut journey times across the junction by about 10 minutes, with a lane through the middle creating the ‘hamburger’ effect.

But driving instructor John Wheeler has complained that signs for motorists travelling towards the roundabout on the A4074 are poor.

He said drivers were ending up in the wrong lane and had to make dangerous manoeuvres to correct themselves. Mr Wheeler, 67, from Kidlington, said: “If you want to travel towards Headington, the natural thing is to move into the right hand lane. But, once on the roundabout, that takes you to the superstore.

“The problem is that the signs do not start until you are a couple of hundred metres from the roundabout. And right in front of the sign is a 50mph sign obscuring part of it.”

He suggested the road markings, which gave the road numbers rather than destinations, were also unhelpful.

He said: “Drivers stop on the roundabout as they can’t get to the left because of the traffic. Imagine what that’s like for a learner.

“Negotiating roundabouts can be dangerous and, in this instance, it is made more so by the lack of adequate signing.”

He suggested a new sign, clearly marking the lanes by both road number and destination, could be installed further back from the roundabout.

He said: “It’s too late to change the layout of the roundabout, but they could improve it considerably.”

Oxfordshire County Council spokesman Owen Morton said the council was aware of the concerns.

He said: “We are in discussion with Sainsbury’s regarding the provision of a new sign to help drivers get into the correct lane in good time.”

Sainsbury’s spokesman Tom Parker said signage was the responsibility of the contractors in conjunction with the council. But he said no complaints had been received from customers.

Taxi driver Ghafoor Khan, from Iffley, Oxford, also said he had no complaint about the roundabout, adding: “It works like a dream.”

Fellow taxi driver Richard Barlow, from Kidlington said: “It’s laid out properly. It just needs a bit of common sense.”