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Cooperative Intelligent Transport Systems (C-ITS) is the European notion for increasing road traffic safety and road traffic efficiency by using wireless communication, both V2X as well as cellular connectivity.
C-ITS encompasses Day One scenarios and Day Two scenarios, where the former extends the awareness horizon for the driver, and the latter extends the awareness horizon for the automated vehicle.
The European Telecommunications Standards Institute (ETSI) standardization for Day One scenarios was finalized in 2014. Large-scale deployment in Europe took off in 2019 when Volkswagen (VW) launched V2X communication and Day One scenarios as a default feature in their new Golf 8.
This deployment has now been extended to also cover their full electric ID family. VW is using the dedicated short-range communication technology IEEE 802.11p (also known as ITS-G5 in Europe). By the end of 2021, there will be more than 700,000 V2X-equipped vehicles on European roads.
Full Article: IEEE Vehicular Technology Magazine, Volume 16, Number 4, December 2021 | 
