Oxfordshire County Council has this week announced plans to make Oxford a 20mph city. The new speed limit will be introduced on most residential streets, as well as sections of A and B roads in busy shopping areas. The initiative, which will cost around £250,000, is designed to reduce fatal road accidents. Councillors hope to see a five percent reduction in casualties as a result of the change. Oxford follows Portsmouth to become the second UK city to introduce the new blanket speed limit.