More work needs to be done to prevent speeding motorists rat-running through a north Oxford estate, a councillor has warned.

In March, Oxfordshire County Council introduced a permanent ban on left turns from the A40 Elsfield Way part of the ringroad into Jackson Road after a successful trial.

The kerb at the junction was rebuilt to enforce the permanent ban and prevent motorists gaining access to Oxford through the Sunnymead area.

But Jean Fooks, the Liberal Democrat city councillor for the Summertown ward, told the Oxford Mail the work to prevent cars turning left from the dual carriageway had not been a total success - and drivers were still taking the short-cut.

She said: "The police have contacted me to say they are very concerned that drivers are still using this short cut.

"Now the junction has been rebuilt, drivers are pulling up very suddenly to make the turn, so police feel it is even more dangerous.

"I am talking to staff at the highways department to ask them to look at this again.

"The whole idea of doing the work in the first place was to protect pupils from Cutteslowe Primary School who cycle to school and other residents."

Oxford police handed out seven fixed penalty notices to drivers on the last occasion they monitored the site.

Sgt Glenn Jones said: "For people turning left from the bypass the turn is now very tight and as such cars have to come to almost a stop to negotiate the turn.

"This is dangerous as vehicles on the bypass would still be at speed and not expecting this."

Sgt Jones said enforcement would not fully prevent offences from taking place and suggested the county council's highways team reviewed the work completed undertaken in March.

He added: "None of the people stopped stated they had not seen the signs - most stated they were in a hurry and were sorry."

Alan Hyde, treasurer of the North Oxford estates residents' association, who had welcomed the change, was unavailable for comment.

Highways chiefs said there was a 70 per cent reduction in traffic in the Jackson Road area after the temporary ban was introduced.