Some are definitely unavoidable (unless you know where they are, and anyway this would often mean coming to a dead stop...not great on an A or B road). My droplinks and a newish tyres went last summer and I am positive it was as a result of hitting all these f-ing holes
Iain, I had a prang a few years ago and got a long term courtesy from Enterprise ( a nice 1.6 Ford Focus). On holiday I cracked the windscreen, took it back, got another one and subsequently went on to crack the windscreen in the replacement 2 days later ! I was most embarrased
L