Thanks everybody. Where exactly are those speed bumps? On the highways or in the town roads? I'm planning to go to Tulum (where I will be staying) and from there to the ruins and maybe to another town or two. I really don't want to crush into speed bumps..

also are the cars there equipped with the typical safety and convinience features that american rental cars come with, or can I get a car without say, power steering or air bags? I have only driven late model american market cars (got my liscence only 4 years ago) so a little worried that I will have tough time adjusting.