This Practice Note identifies the main highways law issues concerning bridges and tunnels as the rights of the public to pass and re-pass across bridges or through tunnels, and maintenance liability for them. It describes the four types of highway bridge and discusses who is responsible for the maintenance of the bridge in each case, referring in particular to the Highways Act 1980 (HiA 1980) and the Transport Act 1968 (TrA 1968). It summarises relevant legislation specific to toll bridges and tolled tunnels, new bridges across navigable water, bridges across boundaries, and footbridges. The main highways law issues concerning bridges and tunnels are as to the: • rights of the public to pass and re-pass across bridges or through tunnels, and • maintenance liability for them The definitions of a bridge and a tunnel in HiA 1980 are not very helpful. Section 328(2) says: ‘Where a highway passes over a bridge or through a tunnel, that bridge or tunnel is to be taken for the purposes of this Act