Oh hell...then what do they call the thinks I'm thinking about??? CRAP!!! LOLRumble strips are on the side, so if you cross the line and start going off the road, it jolts you.
However, this did settle your question BECAUSE I just googled what you called the things in your area and this picture came up:
http://2.bp.blogspot.com/_iDTeIRRw1lI/R1RmLxZcUsI/AAAAAAAAAKw/eZ5SrTFB4-s/s1600-R/No+humps+3.jpg
It's huge, so I just put the link up.