cable cord electrical-power-cable electrical-power-cord extension-cable extension-cord extension-lead flex flexible flexible-electrical-power-cable lengthy power-cord power-extender tangle advice alert announcement be-careful beware black care careful cars caution cautious communicating communication conditions danger dangerous information informing large-vehicles look-out observant red risk risks road-conditions road-train rural-area safety semi-trailers sign signage slow-down speed speed-reduction symbol text traffic trailers transport transportation trucking trucks vehicles warning warning-sign watch watch-out white words