Before revision:  More specifically, in STC, we use cross correlation function to quantize the correlation among roads. Noticing the directional patterns of traffic feature diffusion  , we novelly make the determination of the time lagging factor in cross correlation calculation self-adaptive by using vehicle tracking .
After revision:  More specifically, in STC, we use cross correlation function . The time lagging factor describes the time consumption of traffic feature diffusion , we novelly make the determination of the time lagging factor in cross correlation calculation self-adaptive by using vehicle tracking .