computerised computerized equipment hardhats helmet laser level levels measurement measuring men safety skilled skills surveying surveyors technology theodolite triangulation tripod workers workmen box control control-box danger electric-power electricity electricity-poles electricity-power-lines energy high-voltage high-voltage-equipment house-wiring insulators light power power-pole strength transformers wires wiring abstract arrows background binary blue blueprint brochure cogs copyspace design digital digits direction engineering gears high-tech illustration industrial industry machinery mechanical mechanics modern motion report cover structure technical template wheels work access bollard calculating calculations color colors colour colours flowers man pavement plants roadside shrubbery shrubs surveyor trees tripods worker workman