As milky asked…i will reply……it may be a lot of things but Somerset people often live on wet and muddy roads often used by cow farmers directing their cattle to er other places….
Any way….Crud is a combination of 2 words…crap and mud to describe what happens to the roads after cows walk on wet and muddy roads….LMAO
Even had a rear mud guard for mountain bikes named after this phenomenen…..the crud catcher….LMAO RATF PMl
Hope that answers your question milky…….