In order to commence a claim against a highway authority for a defective road surface causing a cycle accident you need to be able to prove that the highway surface was so defective that it presented a real danger to traffic that might use the road.
Roads are inspected fairly regularly by Highways inspectors, but very often they have no experience of or thought for cycle traffic. Most highway authorities argue that as long as they have inspected the road they have a complete defence even if the road surface was defective. Only specialist knowledge can give you a realistic case against this.
Loose chippings that accumulate on the surface of a road are a hazard to cyclists and present a very real risk of the bike sliding away underneath you. If you have come off your bicycle on gravel chippings from the road then we will need to get photographic evidence quickly when starting a cycle accident claim.