Traffic-light signalling and operation to a double red light. Tianjin in the People's Republic of China has two very special systems of traffic lights, in use since : One system is where there is a horizontal bar in a specific colour, with the colour changing and the bar shrinking. The shrinking bar indicates the time remaining in that colour. The colour itself is either red (stop), yellow or green (go). A blinking green one-third-full bar means "reduce speed now", and a blinking yellow full-bar indicates "proceed with caution". When lights of this system turn from green to red, the diminishing green bar will flash
Port and starboard people are right-handed. Since the steering oar was on the right side of the boat, it would tie up at the wharf on the other side. Hence the left side was called "port". The Oxford English Dictionary cites "port" in this usage since 1543. Formerly, "larboard" was often used instead of "port". This is from Middle English "ladebord" and the term "lade" is related to the modern "load". "Larboard" sounds similar to "starboard" and in 1844 the Royal Navy ordered that "port" be used instead. The United States Navy followed suit in 1846. "Larboard" continued to be used well into