why is fire engine in red colour

bcz fire engine has ladder ...........ladder steps ..........steps are climbed by foot.......foot is measured by a ruler. a ruler can be a king or a queen ,queen of england is elizbeth.she also name of ship .ships floats on water.water has fish ...fishs have fins .fins are people of  finland.the finland national flog is red in colour.sooo fire engine red colour ........