Lights For Public Transport
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Traffic lights for public transport often use signals that are distinct from those for private traffic. They can be letters, arrows or bars of white or colored light.
In Portland, Oregon, the tram signals feature an orange horizontal bar and a white vertical bar. Some systems use the letter B for buses, and T for trams.
In Russia, dedicated traffic signals for public transport (tram, trolleybus or bus) have four white lights that form the letter T. If the three top lamps are lit, this means "stop". If the bottom lamp and some lamps on the top row are lit, this means permission to go in a direction shown. In case of a tram signal, if there are no tram junctions on an intersection, a simpler system of one yellow signal in the form of letter T is used instead; the tram must proceed only when the signal is lit.
In North European countries the tram signals feature white lights of different forms: "S" for "stop", "—" for "caution" and arrows to permit passage in a given direction.
The Netherlands use a distinctive "negenoog" (nine-eyed) design shown on the top row of the diagram; bottom row signals are used in Belgium, France and Germany. The signals mean (from left to right): "go straight ahead", "go left", "go right", "go in any direction" (like the "green" of a normal traffic light), "stop, unless the emergency brake is needed" (equal to "yellow"), and "stop" (equal to "red").
The Hiawatha Line in Minneapolis, Minnesota uses a simplified variant of the Belgian/French system in the city's central business district where only the "go" and "stop" configurations are used. A third signal equal to yellow is accomplished by flashing the "go" signal.
In Japan, tram signals are under the regular vehicle signal; however the color of the signal intended for trams is orange.
In Hong Kong Island, Hong Kong, an yellow T-signal is used for trams, in place of the green signal. Addition to that, at any tramway junction, another set of signals is available to indicate the direction of the tracks.
Read more about this topic: Traffic Light
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