There was a time that I found rumble strips—you know, those zig-zaggy indentions down the middle and sides of highways—to be nothing but obnoxious. They make terrible sounding vibrations when crossed, regardless of whether drivers intend to pass over them or not. They remind me of a dentist using the big drill to grind out a chunk of old filling. My feelings about those asphalt irritations changed the day those rough-carved asphalt concaves saved not only my life but my mom’s. Since then, I’ve new respect for that once disturbing noise.