Why does this happen so often on the left coast?

skipro3 wrote:
I challenge anyone to make that route in any rig at that pace and not break the posted speed limits. Not many cars even have that kind of range; 400 miles.

I assume the mapping software knows the allowable speed limits along the route. I do not believe that any of them account for stops for any reason. Just straight drive time. I have seen my phone actually modify my ETA due to traffic, but it's just averaging my current speed in.