Section 278 Agreement (S278) is an agreement made between a developer and a Highway Authority to enable works to be carried out on the public highway to facilitate development.

The agreement is made under Section 278 of the Highways Act 1980. The need to enter into an S278 usually arises as a result of a planning application made for a development. A condition of consent is that the developer and Highway Authority enter into an agreement to provide new infrastructure and the S278 is