In my experience, those outages don't tend to be frequent on main roads, where there is usually an unobstructed sight-line to the GPS satellites. Sure, it's pos

In my experience, those outages don't tend to be frequent on main roads, where there is usually an unobstructed sight-line to the GPS satellites. Sure, it's possible that this dude floored it, hit 50-60mph for a second or two, slammed on the brakes leaving rubber all over the pavement, slowed to 15mph for a while to make the averages all work out, and proceeded on his merry way at 25mph. But it doesn't seem that likely.