Police have closed off part of the A46 after a lorry shed its load of aggregate near to Thorpe on the Hill.
Lincolnshire Police has closed off the northbound carriageway between the A1434 and B1190 to deal with the incident.
Highways England believe that the lorry has shed up to a tonne of debris on the road, which could mean that the road will be closed for a significant amount of time.
For anyone travelling northbound, there are diversions in place towards the city centre and back onto the A46 at Damon’s roundabout.
Drivers have been warned to expect major delays and to delay their journey if possible.