It is well established that the duty to maintain the highway is imposed by section 41(1) of the Highways Act 1980 (HiA 1980), which provides as follows: ‘The authority who are for the time being the highway authority for a highway maintainable at the public expense are under a duty, subject to subsections (2) and (4) below, to maintain the highway.’ The duty under HiA 1980, s 41 is subject to the statutory defence, provided by HiA 1980, s 58. The provision in HiA 1980, with regard to street lighting, is to be found in HiA 1980, ss 97 and 98, the former of which provides: ‘A highway authority may provide lighting for the purposes of any highway or proposed highway for which they are or will be the highway authority, and may for that purpose— (a) contract with any persons for the supply of gas, electricity or other means of lighting; and (b) construct and maintain such lamps, posts