Dynamic OD Matrix Estimation Model of Freeway with Consideration of Travel Time

Abstract:

Most existing dynamic origindestination(OD)matrix estimation approaches are based on synchronous observed volume.However,when traffic flow runs on a longdistance freeway,the big time lag and platoon dispersion will affect the precision of OD estimation.The paper puts forward the conception of “volume spacetime belt” and a new OD estimation methodology is established based on spacetime analysis.Traffic volume on spacetime diagram is distributed to each “volume belt” and OD matrix is then estimated with the least square method.A practical sample testifies that the new dynamic OD estimation methodology can overcome the defect due to unsynchronized flow and better trace the variation of OD matrix.This character is very important for high simultaneity and accuracy required traffic control system.