The Use Of Speed Limits Speed limits are to help the roads safe for drivers and other road users.
Speed limits are more effective when drivers understand why they are there.
Speed limits do not automatically reduce speed. The wrong speed limit will not only be ineffective but will undermine the value of other speed limits. Lorries, buses and other vehicles may have different limits. 30 mph in built up areas where the street lighting is to the necessary standard. The County Council may vary the national limits subject to consultation.