General Road and Highway Discussion

[SammyOES]

I would say the HTA regulations (where actual speed limits are set), would show the highway speed as 100 km/h (or 90 kh/h in the case of the X-way).  The on-ramps are part of that highway, hence the enforceable speed limit is 100 or 90.  It is recommended you travel 80, but a 500 km/h drive would be an expensive day in court as you are effectively 400 (or 410) over the posted (in the regulations) speed limit.

Coke

You can also get careless/dangerous driving charges. A 500 km/h drive is probably going to be jail time.