The value is calibrated according to the data collected from (t-2 t) to (t- t) . m and n is the observed
number of bus vehicles and taxies. is a variable related to mixed traffic flow properties on the link. It can be
estimated by the historical data using equation (1). Considering the fluctuation of the traffic, it is reasonable to
use different values of in one day. The weights of bus running speed in the model are refreshed in such a way
that they would increase with the increase of the number of observed bus vehicles.