Development of origin–destination matrices using mobile phone call data

43 In this research, we propose a methodology to develop OD matrices using mobile phone Call 44 Detail Records (CDR), which consist of time stamped tower locations with caller IDs, and 45 limited traffic counts. CDR from 2.87 million users from Dhaka, Bangladesh over a month and 46 traffic counts from 13 key locations of the city over 3 days of the same period are used in this 47 regard. The individual movement patterns within certain time windows are extracted first from 48 CDR to generate tower-to-tower transient OD matrices. These are then associated with 49 corresponding nodes of the traffic network and used as seed-OD matrices in a microscopic traffic 50 simulator. An optimization based approach, which aims to minimize the differences between 51 observed and simulated traffic counts at selected locations, is deployed to determine scaling 52 factors and the actual OD matrix is derived. The applicability of the methodology is supported by 53 a validation study. 54