  This paper introduces our Cyber-Physical Mobility Lab (CPM Lab). It is an
open-source development environment for networked and autonomous vehicles with
focus on networked decision-making, trajectory planning, and control. The CPM
Lab hosts 20 physical model-scale vehicles ({\mu}Cars) which we can seamlessly
extend by unlimited simulated vehicles. The code and construction plans are
publicly available to enable rebuilding the CPM Lab.
  Our four-layered architecture enables the seamless use of the same software
in simulations and in experiments without any further adaptions. A Data
Distribution Service (DDS) based middleware allows adapting the number of
vehicles during experiments in a seamless manner. The middleware is also
responsible for synchronizing all entities following a logical execution time
approach to achieve determinism and reproducibility of experiments. This
approach makes the CPM Lab a unique platform for rapid functional prototyping
of networked decision-making algorithms.
  The CPM Lab allows researchers as well as students from different disciplines
to see their ideas developing into reality. We demonstrate its capabilities
using two example experiments. We are working on a remote access to the CPM Lab
via a webinterface.
