The M1 southbound, between junctions 18 and 16 in Northamptonshire, is currently closed following a serious accident at about 13.20pm.
The M45 eastbound has also been closed at its junction with the A45 to prevent traffic joining the M1 southbound at junction 17.
The diversion route is signed with the hollow square symbol.
Abellio, who run the Greater Anglia rail line, has been named Train Operator of the Year at the annual national Rail Business Awards.
Greater Anglia train operator Abellio says it's made real steps in customer service and punctuality in its first year in charge.
Greater Anglia have apologised for the delays that have disrupted services today