Congestion, accidents, greenhouse gas emission and others seem to become unsolvable challenges for all levels of man- agement in modern worldwide large cities. The increasing dynamics of motorization requires development of innova- tive methodological tools and technical devices to cope with problems appeared on the road networks. Primarily, control system for urban trac area has to be created to support decision makers via operating with big transportation data. The input for a such system is a volume of travel demand between origins and destinations { OD-matrix. The present work is devoted to the problem of OD-matrix estimation. The original technique of plate scanning sensors location is oered. The developed method has been tested on the experimental parameters of the Saint-Petersburg road net- work.