A man walking home from a night out was badly injured when he was hit by a cyclist on a riverside path.
The pedestrian suffered head injuries when he was struck near Scarborough Bridge in York at about 23:15 GMT on Saturday, police said.
The man, who is in his 50s, was taken to hospital and remains in a serious condition, although he is said to be "showing signs of improvement".
Officers have urged the cyclist involved to come forward.
A member of the public helped the man following the collision, with further witnesses asked to contact North Yorkshire Police.