Like others have said, an old steel mountain is probably the best solution. But, a road bike should be fine if you learn to scan ahead and avoid things. Some Schwabe Marathon tires in 27" size would be a perfect way to bombproof your current wheels against glass and debris. There are a few potholes on my route that would swallow the 4" wide Surly endomorph tires. Prevention is always better than mitigation. Also, an excellent headlight mounted low on your bike (on the fork) is key to avoiding road hazards at night.