Driver died on the A1 at Marston after attempting illegal shortcut across carriageways | Updated: 09:29, 17 March 2021 A car driver was killed in a collision after he attempted an unlawful shortcut to get on the northbound carriageway of the A1 near Grantham. An inquest hearing was told traffic emerging from Toll Bar Road at Marston and wanting to travel north must first join the southbound carriageway and come off at the roundabout at Gonerby Moor. Footage from CCTV cameras at the Esso Toll Bar service station at the Marston turn-off captured Shaun Hanmoreâs Audi A6 following a Range Rover to a gap in the central reservation designed for motorists turning right from the northbound carriageway into Toll Bar Road.