Well, Allen has their Sharrows painted out there on some streets. But what is a Sharrow?
The sharrows are just markings to remind drivers and cyclists that we all share the same roads out there. Nothing more than that! So, go out and ride your bike (or drive your car) because you can! That is what the roads are for.
A nice article was written in today's paper: http://neighborsgo.com/stories/81158
You can also find the Allen American article from last week: http://www.allenamerican.com/articles/2012/03/16/allen_american/news/157.txt
Get out and enjoy your bike!