The driver who hit and killed a man walking along the A90 after a night out may be "completely unaware" of the collision, police have said.
Neil Smith, 32, was found dead on the eastbound carriageway near Kinfauns at about 0430 BST on Saturday.
It is thought the police Scene of Crime Officer was walking to a friends house when he was hit by a vehicle.
Police have appealed for lorry, bus and HGV drivers who were on the road to check their vehicles for damage.
Mr Smith's body was found by passing lorry drivers just before the Kinfauns flyover.
Ch Insp Sandy Bowman said: "We have already spoken to a number of lorry drivers who saw Neil walking along the side of the A90 but we still need to trace the vehicle responsible for colliding with him.
"It's possible that the driver of the vehicle responsible is completely unaware that they have hit someone, or they may even have believed they had hit an animal, as it would still have been dark at the time of the collision."
The officer asked all drivers who were on the A90 between midnight and 0430 BST on Saturday to get in touch so their vehicles could be checked.
He added: "'Through CCTV footage we are building up a picture of all vehicles that would have been on the road and we are making contact with all the companies we know would have a fleet on the road.
"Similarly, we are tracing the owners of cars and vans on the road in order to have vehicles examined.''
Mr Smith, was a Scene of Crime Officer with the the Scottish Police Services Authority, based in Dundee.