You cannot leave anything by the roadside, be it ramps or pieces of wood. We had our kerb dropped by the council, due to the width of our drive it came to just shy of £800. Next door has paved some of their front garden to park cars, they did not drop their curb and just left wood to step up to the pavement which never stayed flush against the curb once driven over. They have since been slapped by the council for intentionally leaving an obstruction on the road or something like that. be warned.