Police closed the A1175 at Market Deeping after a serious crash between a lorry and a pedal bike on Thursday afternoon.
Lincolnshire Police officers received a report of a collision between a green and yellow DAF dropsided lorry and a pedal cyclist just after 11.30am on April 16.
It happened at Deeping Common on the A1175 with the junction of Cross Road.
Police said shortly after 2.30pm that the road remains closed.
Police are appealing for anyone who witnessed the crash to contact them on 101 or via email at [email protected] quoting incident number 125 of April 16.
Alternatively, it can also be reported through the independent charity Crimestoppers anonymously on 0800 555 111 or online here.