Thanks to all your replies. I appreciate it.
Indeed. I'll try the ramp at different speeds and see what happens. Unfortunately the gauge on the HUD is not accurate enough to go negative. It will just read zero.
OK - so here is a twist on my original question: I'm watching the NASCAR...
I few weeks ago I purchased a new Camaro with a Head's Up Display and among the data presented is a g-force meter. The meter does not show acceleration or deceleration; instead it is strictly lateral. Yesterday I entered a long and banked on-ramp to a freeway and the g-force meter reached...