Police have appealed for witnesses following a collision involving a cyclist and a bus on the northbound carriageway of the A90 Dundee to Aberdeen road, near the Cortins junction, Bridge of Muchalls.
The incident happened at around 8.30pm on Wednesday, March 29.
The 43-year-old man who was on the bike was taken to Aberdeen Royal Infirmary with serious injuries where he remains in a stable condition.
The 56-year-old man who had been driving the bus was uninjured.
Roads Policing Sergeant Steve Manson, who is leading the investigation into the circumstances, said: "We are appealing to anyone who may have witnessed the collision or seen a pedal cyclist on the A90 prior to the incident to contact police as soon as possible on 101.
"Shortly after 3pm police received a report of a man with a bicycle walking on the central reservation of the A90 near Stonehaven.
"Police attended and the man was given suitable advice.
"Shortly before 3.40pm police received a further report of a man with a bicycle walking northbound on the A90 near Stonehaven, he was traced by police, taken to Stonehaven where he advised that he would get a bus to Aberdeen.
"At around 7.40pm there were further reports to police of a man wearing dark clothing, cycling north on the A90 near Muchalls, Stonehaven. Police were unable to trace the cyclist at this time.
"Around 8.30 pm, a report was received of a cyclist having been involved in a collision. Police and ambulance attended.
"I would urge anyone with information or who saw a cyclist on the A90 near Stonehaven wearing dark clothing and riding a dark coloured pedal cycle, particularly near to the time of the collision or who saw a man matching this description pushing a bike to contact officers as soon as possible."