Sat-navs are telling drivers to speed on the A17 near Terrington St Clement, where three people have died in recent years, county roads officials have claimed.
Ian Temperton, a casualty reduction manager with Norfolk County Council, said sat-navs say there is a 70mph limit on the single carriageway A-road. In fact, it is 60mph, the standard limit for a single carriageway road.
He said: “Sat-navs, while undoubtedly a great boon, are not infallible.
“They are sometimes inaccurate and won’t always have the most up-to-the-minute information on things like new road lay-outs and temporary speed limits.”
But Jenny Martin, general secretary of Intelligent Transport Systems which represents sat nav companies said it was up to the Highways Agency to update information.