Killer A9

Killer A9 is the nickname given to a section of the A9, Scotland's longest road, known for its high accident and fatality rates. The 112 mi section, running between Perth and Inverness, changes from a dual carriageway into a single carriageway, and motorists driving at excessive speeds to overtake lines of slower-moving vehicles before the dual-carriageway ends is the primary cause of the road traffic accidents. Dangerous overtaking manoeuvres on the long single-carriageway stretches of the road are also contributing factors, as are the non-grade separated junctions along the northern sections, where drivers make a right turn across the opposing traffic flow. There are also several hundred deer strikes each year, with around 200 recorded in 2013. The introduction of average-speed cameras have reduced deaths slightly.

Statistics and status
As of July 2023, 335 people had been killed on the Perth-to-Inverness stretch of the road since 1979 (an average of 7.6 death per year), 59 of which occurred between 2011 and 2022 (an average of 5.4 deaths per year). The "A9 Dual Action Group" was established to bring attention to the statistics. It submitted a petition to the Scottish Parliament in December 2022, calling on the Scottish Government to follow through on its 2011 commitment to convert the remaining 77 mi of single carriageway into dual carriageway by 2025. At an expected cost of £3 billion, the A9 dualling project would be the biggest transport project in Scotland's history. In 2023, the Scottish National Party stated that the dualling of the road would not be completed by 2025.

In June 2024, Transport Scotland figures reported that along single carriageways on the A9 there were 199 injuries and 15 deaths compared to 114 injuries and 7 deaths on dual carriageways, highlighting a double fatality rate for the undualed sections of the road.