The One model will be updated to represent all network and Intelligent Transportation Systems (ITS) changes that have occurred since the previous model was built in 2014-5. Working collaboratively with the TfL Strategic and Surface Modelling teams, Aimsun will deliver an integrated large-scale static (macroscopic) model and a large-scale dynamic (mesoscopic) model that cover the whole of Greater London out to the M25 Orbital Motorway perimeter. Using the dynamic model as a starting point, TfL can take a coordinated approach to scheme evaluation, road works and traffic management. The idea is not only to consolidate existing models, with all the efficiency, consistency and cost reduction that this implies, but also to update the model and enrich simulation knowledge through enhanced time segments. Now owned by Siemens, Aimsun has a long working history with TfL and will provide the software and services for an integrated, multi-level platform for modelling the city’s transport. At this week’s Traffex show in Birmingham, UK, Spain-based transportation software developer Aimsun unveiled a major new agreement with Transport for London (TfL) to convert the London One Model into the company’s Next traffic modeling software.