I think the bike will be safe as long as you don't do anything crazy.
It wouldn't choose that bike though. I had an older CAAD (4?) and it was the stiffest riding bike I've ever had, not fun for long rides. Add to that the fact that you'll be limited to narrow tires, that will not help either. Comfort while (and after) riding really contributes to motivating you to ride more, make sure your bike of choice doesn't beat you up or it won't get ridden.
My $0.02. Good luck.