  The quest for safer and more efficient transportation through cooperative,
connected and automated mobility (CCAM) calls for realistic performance
analysis tools, especially with respect to wireless communications. While the
simulation of existing and emerging communication technologies is an option,
the most realistic results can be obtained by employing real hardware, as done
for example in field operational tests (FOTs). For CCAM, however, performing
FOTs requires vehicles, which are generally expensive. and performing such
tests can be very demanding in terms of manpower, let alone considering safety
issues. Mobility simulation with hardware-in-the-loop (HIL) serves as a middle
ground, but current solutions lack flexibility and reconfigurability. This work
thus proposes ColosSUMO as a way to couple Colosseum, the world's largest
wireless network emulator, with the SUMO mobility simulator, showing its design
concept, how it can be exploited to simulate realistic vehicular environments,
and its flexibility in terms of communication technologies.
