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Public transport (buses) and cars have different requeriments:
In a car, you would prefer that traffic lights go green as you approach, "green waves" go with the traffic flow and once you are in a "green wave" you don't stop - unless you are too slow and a "red wave" catches you.
In a bus, since it has to stop constantly, you would miss those "waves" all the time... then if you want to favour public transport (better overall FE!!) those "green waves" go against traffic, but it is totally inconvenient for cars...
Maximum overall efficency is not as easy as it seems
-- My brother gave me this explanation once, he is a road engineer --
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MrK
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