Euan Johnston was shot in his car last month.
A9 Cameras "Reduce Injuries"
The introduction of average speed cameras on the A9 has failed to cut deaths but the number of injuries has more than halved, an analysis of the first six months of operation has found.
Four people died on the A9 in the six months after the cameras were installed in October 2014 but police say excessive speed or overtaking does not appear to have been a factor in these deaths.
The number of deaths was similar to previous years, with nine people killed in 2011, eight in 2012 and seven in 2013, amounting to an average of four deaths every six months before the cameras were installed.
However, just three people were seriously injured after the cameras were installed, compared with a previous average of 10, and 22 were slightly injured, down from an average of about 45.
There has also been a significant reduction in the number of vehicles exceeding the maximum speed limits, according to analysis compiled by Transport Scotland's A9 Safety Group.
A spokeswoman said: "When compared to the average for the same period between 2011-2013, the number of fatal and serious casualties between Dunblane and Inverness is down by 50%.
"There have also been substantial reductions in the number of injury accidents and the number of casualties overall.
"Whilst these figures are encouraging, we will continue to monitor the route over the coming months and years to build upon these early results.
"We continue to be concerned about the number of fatal accidents on the A9 and we are working to further improve the safety of the route, as we do across Scotland."
Superintendent Fraser Candlish, of Police Scotland's road policing division, said: "Police Scotland welcomes the 50% reduction in serious injuries in the area covered by the A9 cameras since they were installed.
"Sadly, during the past six months there were three fatal crashes which resulted in four people losing their lives.
"As these incidents are still being investigated I am not able to comment on the circumstances other than saying initial findings reveal that excessive speed or overtaking was not a contributory factor.
"While speed camera activation on the A9 has risen during the past six months, the figures show the vast majority of drivers are complying with the speed limits.
"Speeding is not the sole reason for crashes and Police Scotland is committed to deploying high-profile road policing officers on the A9 to influence driver behaviour positively and keep people safe.
"I continue to urge road users on the A9, and other roads, to concentrate on safe driving and avoid risky behaviour.
"Police will continue to challenge those who put themselves and others at risk in this way and make our roads safer."
The family of three crash victims took their case for the 59-year-old to be put on trial to the Appeal Court in Edinburgh earlier this year.
A further four people have been arrested in connection with disorder at the end of the Scottish Cup final.
Police in Scotland have contacted MP Michelle Thomson after she revealed that she was raped at the age of 14.
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