 Other relevant legislation includes the Highways Act 1980, where Sections 90A-F cover road humps and Sections 90G-I cover other traffic-calming works.Part VI of the RTRA 1984 deals specifically with speed limits, with Sections 81–84 dealing with different speed limits and the speed-limit order-making process.In Northern Ireland, the Highway Code of Northern Ireland has only three references to the "built-up area" and does not define it.