Any front braking whilst leant over will cause the bike to sit up, loosing the ability to turn, add a bit of target fixation, looking at something thinking s**t im going to hit that, and you probably will, As for the road surface, the council have a duty of care, and should have records of regular inspections, you could always ask for these, as the surface is broken and uneven it could be considered as a contributory factor to the incident, its worth a go mate, whats the other option? cheers wes.