Another option for a road bike without a high top tube is a Bike Friday (folding) bike. I absolutely love mine. The bikefriday.com web site is a wealth of information, and a couple of us here on this forum have Fridays, so if you have any questions, just ask!

I agree too about the recumbent trikes. The president of our bike club has one (as well as various upright bikes) and rode it on a ride the Sunday. He looked like he was having a blast, and he had no difficulties keeping up with other riders either. He does have a flag on the back since he sits so low to the ground, but with the flag was very visible.

Emily