The TSS timeline

Follow TSS’s journey from a university research lab team to the international company that markets, develops and supports Aimsun traffic modelling software.

At a glance: the evolution of Aimsun traffic modelling software

A brief history of TSS


Members of the former LIOS (Simulation and Operations Research Laboratory) at the Polytechnic University of Catalonia (UPC) develop a microsimulator prototype. This microsimulator is eventually named AIMSUN2 (Advanced Interactive Microscopic Simulator for Urban and Non-Urban Networks).


TSS-Transport Simulation Systems is officially founded on 11th November 1997. Technical development continues at the university lab but TSS opens an office in c/Tarragona in Barcelona, with a tiny core team dedicated to commercialising the software. TSS sells AIMSUN within a simulation environment called GETRAM (Generic Environment for Traffic Analysis and Modelling), which also contains a traffic network graphical editor (TEDI), a network database, a module for storing results and an Application Programming Interface for interfacing assignment models.


GETRAM 4.0 released.


TSS moves to a larger office on c/París in central Barcelona and begins to grow, steadily bringing in new developers – many of whom are still with us today.


TSS moves into its current Barcelona head office in Passeig de Gràcia. There are separate departments for Development, Projects, Marketing, Accounts and Management.


GETRAM becomes AIMSUN NG (New Generation), the world’s first integrated macroscopic and microscopic traffic modelling software; the package also includes integrated editing and simulation.

Aimsun Online pilot project in Singapore


AIMSUN NG drops the caps and becomes Aimsun, adding mesoscopic simulation and Dynamic User Equilibrium assignment to the toolbox of version 6.


Aimsun 6.1 integrates Legion’s pedestrian simulation engine as an Aimsun plug-in.


TSS opens a new branch office in New York City.


TSS opens a branch office in Paris, France

Aimsun 7 includes hybrid mesoscopic-microscopic simulation.

Aimsun Online selected as platform for DSS in Interstate 15 San Diego ICM demonstrator project.


TSS opens an office in Sydney, Australia.


Aimsun 8 incorporates full support for four-step travel demand modelling.

I-15 Integrated Corridor Management project in San Diego wins the 2013 ITS America award for Best Innovation.


The latest release of Aimsun 8 is 8.0.3 (R28004), released on 20 March 2014

As of 30th April 2014, there were 3,017 active Aimsun licences – of which 1,433 were Classroom licenses – in 66 countries worldwide.

TSS opens its UK branch in London

Our logos through time

One of the first logos

Then we went red

Then the official TSS company logo came along

Then the Aimsun logo started spinning

Then it went blue

Then we kicked that spin into shape

And we also added this!