Regulation 35—Caption for line markers in prominently developed urban areas(1) Without limiting regulation 34, the letters on each line marker located in a prominently developed urban area shall be at least twenty-five millimetres high with six millimetres stroke.(2) For the purposes of this regulation, a “prominently developed urban area” means(a) a class location unit that has forty-six or more buildings including where buildings with four or more storeys above ground are prevalent and intended for human occupancy; or(b) an area where the pipeline lies within ninety-one meters of a building or a well-defined outside area.(3) For the purposes of paragraph (b) of subregulation (2), a well defined outside area includes a playground, recreation area, an outdoor theater, or other place of public assembly, that is occupied by twenty or more persons on at least five days in each week for ten weeks in a twelvemonth period but the days and weeks need not be consecutive.