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Using osm2po to extract traffic signal in the vertices used to provide the value 1 in the clazz column of the vertex table:
Add vertices costs to postgresql routable network
For some reason I keep getting the value -128 now. Is that supposed to be like this?
I could fix the problem by enabling
in the OSM2PO-Routing section
now both barriers and traffic signals (1,-128) are written
Required, but never shown