A9 as above must have orders of magnitude more traffic. So not like with like. Not too many really local traffic (tractors &c) unlike the A96 or similar.
A9 is also quite a long road (rarely go on the bits N of Inverness or S of Perth) which I guess flattens out the numbers.
however…
On my big cycle 10 days ago, bypassing A9 by Pitlochry, air ambulance in attendance at the Killiecrankie section, serious injuries that one I think.
Last week, needed to get down to Glasgow and back. On way down, couple of cars barrel past me around Aviemore, oncoming traffic, nothing unusual, lo and behold there’s another one, which then tries to occupy same space as car behind me, v near to an accident that one, he then overtakes me round about Alvie, again in face of oncoming traffic.
By House of Bruar, Luton type van in ditch, road closed.
On way back, just short of Dalnacardoch / Dalmein, big black Merc rocket ship, barrels past me and maybe 3/4 cars, then makes plume of smoke emergency stop and then goes up the NCR alongside the A9 at warp speed, presumably to ‘get past’ the remaining traffic, eye watering stuff…