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The main way to interact with a running simulation is TraCI which gives the complete flexibility of doing cross-platform, cross-language, and networked interaction with SUMO acting as a server. One major drawback is the communication overhead due to the protocol and the socket communication. To have a more efficient coupling without the need for socket communication, the TraCI API is provided as a C++ library with the followin properties:

  • C++ interface based on static functions and a few simple wrapper classes for results which can be linked directly to the client code
  • Function signatures similar to TraCI
  • Pre-built language bindings for Java and Python (using SWIG)
  • Support for other programming languages via SWIG


The following things currently do not work:

  • running with SUMO-GUI
  • subscriptions that require additional arguments (vehicle.getLeader)

Downloading Libsumo

Libsumo is not part of the default package. It can be downloaded from the extended package [1] as part of the nightly build.

Building it

It currently requires cmake and swig being installed together with the developer packages for Python (and Java if needed), for Windows see Installing/Windows_CMake. You need to (re-)compile sumo yourself under Windows following the remarks above, under Linux it is probably just a matter of calling cmake and make. For the python bindings you will get a and a (or .pyd on Windows). If you place them somewhere on your python path you should be able to use them like that:

Using libsumo


import libsumo
libsumo.start(["-c", "test.sumocfg"])

Existing traci scripts can mostly be reused by calling

import libsumo as traci

In this case, it is not possible to use the traci.connect and traci.init API functions. You must always use traci.start.