Wow now you got me scared to drive around in Cozumel. Last trip down I had a truck for 3 weeks and drove just about everywhere, including back by scuba repair shop. I thought it was the most "tricky" right where the cruise ship folks were at by the el presidente, seemed like total chaos there. But in the back part of the city although heavy at times with traffic seemed easier.
I worry most about scooters/motorcycles passing on the right side way to close.
Saw one bad accident as a small cc motorcycle tried to pass on the right and hit the curb, went over the handle bars, hit the pavement, bounced and helmet flew off and hit again with bike coming down on top of him.
I don't know why insurance can not offer the "lost wages" as an option, with different limits, maybe 5, 10, 20K.