A cyclist was left with two broken elbows after a van cut him up while turning off Portland Road before fleeing the scene.
The white Mercedes Sprinter van overtook the 51-year-old cyclist on Portland Road, and then immediately cut across his path to turn left into Rutland Road.
He then fell, breaking both elbows.
Police conducted enquiries in the area but have so far been unable to trace the driver of the van.
They are now appealing for witnesses to the incident, which occurred in Portland Road about 8.49am on Friday 22 March.
Anyone who saw what happened or who may have dash cam or CCTV of the incident is urged to report it online or email collision.appeal@sussex.pnn.police.uk quoting serial 238 of 22/03.