Police have returned to the spot where schoolgirl Elli Williams was killed in a bid to track down more witnesses.
Officers hoped to trace drivers making a repeat journey on the A9 near Auchterarder where the 16-year-old died a week ago.
The Morrison’s Academy pupil was killed as she was struck by several vehicles while walking along the dual carriageway.
Her body was discovered shortly after 10pm, forcing the closure of the road as inquiries were carried out.
The drivers of four vehicles which struck the girl have been spoken to by investigators but it is believed the vehicle involved in the initial collision has not yet been found.
Police described the response to appeals for information as “excellent” but still need more help and were stopping northbound and southbound motorists from 9pm-11pm on Tuesday.
Inspector Grant Edward, head of road policing in Perth and Kinross, said, “Our hope is that we will be able to identify people who travelled through the scene of the accident on the A9 a week ago and who we have not spoken to so far.
“They could have information that helps us to fully establish what happened to Elli at and around the time of this tragic incident.”Improvements urgedAnyone with information can call Tayside Police on 0300 111 2222 or speak to any officer.
Meanwhile, the Auchterarder Community Council chairman said repeated requests for road safety improvements at the site have been turned down for financial reasons.
Michael Benton said residents are concerned the route from the town to Gleneagles station sees people risking their lives on the busy road rather than make the trek across the golf course.
It is thought that Elli may have been returning from the train station when she was killed.
Mr Benton said, “We have been going on about this for a very long time but all we get is the standard answer that there is no money.
“There are all kinds of things that can be done to improve access. The idea of a footbridge has been knocked on the head because the centre area isn’t wide enough.
“But even if they put speed cameras at the side of the road down there it would lessen the risk of an accident.”
Perth and Kinross Council said it was a matter for Transport Scotland, whose spokesman said it would be inappropriate to comment during a live police investigation.