Four people died in last July's crash at The Slochd
Paul Anderson and Samantha Carr were among six deaths on the A9 in the Highlands during July 2008.
The engineer and his four-year-old granddaughter died on a stretch of the trunk route near Kingussie in Badenoch and Strathspey.
Just days later, three adults and a one-year-old boy were killed at The Slochd, north of Aviemore.
The victims were Guido Coffeng, 35, and son Naut, along with David and Juliet Oswald, 71 and 68, from Fife.
Mr Coffeng's wife Karina and their daughter Carliyn survived.
Three of the Oswald's four dogs perished in the crash.
Though it is the main road link between the Highlands and central Scotland, only a few stretches of the A9's length is dual carriageway.
This fact and the number of fatalities has been the subject of petitions calling for massive improvements.
Making the A9 between Perth and Inverness dual carriageway are among Scottish Government priorities.
The road features in the government's Strategic Transport Projects Review, which was launched last December.
It is a transport plan for the next 20 years and includes 29 transport investment priorities.
Last August, research claiming the upgrading of a road in the central belt cut the number of fatal accidents to zero within a year was flagged up as a reason for improvements to the A9.
Surgeons Evan Crane and Gavin Tait looked at the effect of replacing 9.4 miles of A77 south of Glasgow with motorway on road casualty statistics.
Nationalist MSP Fergus Ewing said at the time he would use the clinicians' findings to reinforce calls for dualling the Highlands road.