We sometimes have to do that because the main road and the cyclestreet are converging to the same traffic signal, but it wouldn’t be possible to put one single node for both of them.  (And I admit there is something strange because a motorist coming from the cycle street will stop at the light and won’t notice there is a bicycle box before.)  Both nodes are necessary, otherwise routers will believe one of them can proceed to the intersection without any traffic signal.

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