I believe there can be safe speed.
Craig Lowndes in a new falcon ore doing 62 in a posted 60 zone I dare say would be safe than soccer mum in a 90s suv on 60.
He is still speeding.
As stated, I think our limits are in need of review.
I travel to work every day on a stretch or road that goes through 2 small towns.
The towns have always had a posted limit of 60, which is fair enough.
The 3 sections outside of the towns, used to be 100.
I can literally remember driving on them when 2 sections were still 100.(I owned a hq at the time)
Now, they're all 80.
I suspect it was due to being cheaper to replace signs than resurface the road.
The road has since been resurfaced, cars can handle better, stop better and are safer, yet the speed limit remains.
You can comfortably sit at 100 along these roads, but not allowed anymore.
In regards to approaching the limit, I don't remember anywhere there being literature on maximum acceleration, and I do this quite frequently.
One last note....
Yes, we should do track days.
But a few have closed and are gone forever.
People complain about the noise (the same people who are the first to say take it off the streets).
I don't understand why the tracks aren't better backed(government) to help get speeding of the streets.
Go to eastern creek, can't race with friends in the car, friends are half the reason youth do this stuff on the streets.
Give them somewhere to show off and show their fronds what their car can do.