Type describing a signal group. This value is the sum of two values: 1. In German "Überfahrzeit" which expresses the time cars are entering the node when the dropping already has occured. 2. In German "Räumzeit" which is the time needed for vehicles to clear the node. Combined with the "Einfahrzeit" of a roughcasting signalGroup the interim time can be computed as (Überfahrzeit + Räumzeit) - Einfahrzeit See documentation of element passingClearingTime. Type extending an id reference to a Link by an attribute specifying the number of lanes. Optional argument capturing the length of this lane in meter. Number of lanes in reality represented by this signal lane.