I live in a cul-de-sac serving 17 houses. The road hasn’t been adopted by the council and is full of pot-holes. If someone was injured or a car was damaged, who would be responsible: the individual householder in front of whose property the accident occurred, or all 17 householders collectively?
Generally the person who owns the section of road where the accident occurred would be liable. I would expect each house owner to own the section in front of his or her property, but check your title deeds to confirm this. If you notify the local authority of the potential danger it’s possible the council will adopt the road and maintain it in future but it may well ask the householders in the cul-de-sac (assuming they own the road) to meet the initial cost of bringing it up to standard.