Two people ran off from a car after it crashed into a bridge near Boston, leaving it closed and traffic diverted, in the early hours of this morning (Friday).
A police spokesman said forces were called to Cowbridge, shortly before 2am, after a black BMW collided with the bridge.
They said witnesses, who had been fishing near the incident at the time had said at least two occupants had left the scene before police arrived.
The men are currently being traced and witnesses sought who may have been in the area last night.
The bridge area is currently closed while it is examined for structural damage and road diversions are in place.
Information to: Lincolnshire Police on 101, quoting incident number 24 of July 12.