Thanks. I checked the website and besides the description of the route, these were the only rules:

* All cyclists must wear USCF/Snell/ANSI-approved helmets correctly, sleeves and follow center-line rule.
* No aerobars allowed.
* Licensed racers must wear team uniforms.

Guess I'll contact the commissioner to make sure.

I also checked last year's winners and sometimes 3 people were listed, and in my case only 5 were listed. In the men's division, there were usually 10-15per age group, so I'm thinking that this may be all there is in each category? Each age group starts 5 minutes apart. I don't think cycling is big in central Missouri yet, but hopefully, we'll get there! Thanks again for your help.