<P> In Germany, the Czech Republic and some other Central European countries, a combination of red and orange lights is illuminated just before the green phase . Drivers are thereby cued to prepare to go (e.g., by restarting engine, if necessary, and / or shifting into a drive gear). The light sequence is as follows: </P> <Ul> <Li> Green: safe to cross . </Li> <Li> Orange: continue to cross only if unable to stop safely . </Li> <Li> Flashing orange: cross with caution, obey signage (used when lights are out of order or shut down). </Li> <Li> Red: do not cross . </Li> <Li> Red and orange: do not cross, prepare for green . </Li> </Ul> <Li> Green: safe to cross . </Li> <Li> Orange: continue to cross only if unable to stop safely . </Li>

How many traffic lights are in the world