It has almost certainly happened to each of us - you’re driving down the road on cruise control. You’re not doing anything reckless, but your mind is on a million things besides the stretch of road you’re on. You’re thinking about your destination, how long it will take to get there, whether you have enough gas, what’s for lunch, and why no one seems to know how to use a turn signal any more.

The next thing you know, you’re literally shaken back into focus by the rumble strip just on the other side of the white line. You’ve drifted a bit, so you make a slight course correction to straighten things out, and continue on your way with more focused direction.

No big deal, right? Right. But things could have gotten really dicey if it weren’t for that rumble strip.