Maybe the driver was asleep or suffered a med. condition, doubtful but who knows. Flip side, yesterday i caught myself doing 60 in a posted 55 work zone. I try my best to obey signs, it was friday afternoon headed back to the terminal and i was feeling crappy but yea, no Excuse! Funny thing though, i had tons of room in front of me cause everyone else was doing 65-70 in the same work zone running in a pack.