Two level crossings were closed to traffic after scheduled train track repairs overran.
Drivers were delayed by the unexpected closure of crossings on the A1175 at Tallington and the B1443 Glinton Road, Helpston, this morning (Tuesday).
A Network Rail spokesman said overnight work to repair the track had taken longer than expected so the barriers at both crossings had to remain closed while specialist machinery was moved.
The spokesman apologised for any inconvenience caused to drivers.
The roads were open again by 10am.