holding and station skipping. For simplicity, in this application the holding will take only four possible values: 0, 30, 60 and 90 (s) at the selected bus stops. The station skipping is defined with ‘‘0” value when the bus skips the stop and ‘‘1” otherwise. Both manipulated variables are exclusive of each bus-stop. Thus, when the station skipping is applied, the holding action cannot be applied at the same station. Thus, the following states of the manipulated variables are defined: