Detectives have returned to the spot where a police worker died after being hit by a vehicle a week ago.
Neil Smith was walking to a friend's house after a night out when he was killed on the A90 Dundee to Perth road, just before the Kinfauns flyover.
The body of the 32-year-old from Dundee was found at 0430 BST last Saturday.
Ch Insp Sandy Bowman said it was ironic the scene of crime officer, who often collected evidence from crash sites, had not seen justice done for himself.
Police said it was likely that the vehicle which hit Mr Smith would have sustained damage to the wing.
Despite several public appeals for the driver to come forward, no-one has contacted the Tayside force.
Officers who returned to the scene in the early hours of the morning stopped lorry drivers and motorists to find out if they had been on that road last weekend.
Ch Insp Bowman, who is leading the investigation, also made another direct appeal to the public.
"If you know of any large goods vehicles, vans or cars that have recently sustained damage you must notify us in order that we can investigate further," he said.
''It's vitally important that we trace the vehicle and driver responsible for this incident, not just from a policing perspective, but more importantly for the sake of Neil's family who have a right to know what happened to their son and brother.
''I'm convinced that somebody knows that either they were responsible for this collision or their partner, work colleague, or even their friend was responsible. I would ask these people to do the right thing and to get in touch with us.''
He said CCTV footage was building up a picture of the vehicles on the road at the time, and the force has also made contact with companies which had a fleet on the road.
"Similarly, we are tracing the owners of cars and vans on the road at the time in order to have vehicles examined," he added.