Uujudy:
The Villages are a great location for road biking both within the borders of TV and outside. Do not kid yourself, there are some big hills to be found, especially near 466A.
On the circles, there are specific rules of the road for bikers. I suggest that you access the web page for the Sumter Landing bike club as it lists safety rules in it. at the monthly meeting of the club, safety rules are addressed including rules for the circles.
the web page for the club is:
http://sumterlandingbicycleclub.org/
The organized rides for the bike clubs in TV are a great way to travel safely in a group and to meet other bikers of similar skills and experience.