Before revision:  Aiming to handle the incompleteness problem as well as estimate travel speed accurately, in this paper, we propose an approach named STC in which spatial-temporal correlation among travel speeds of roads is leveraged.
After revision:  Aiming to handle the incompleteness problem as well as estimate travel speed accurately, in this paper, we propose an approach named STC that exploits the spatial-temporal correlation among travel speeds of roads is leveraged.