  This white paper offers a comprehensive overview of the protocols utilized in
the field of intelligent transportation systems (ITS). The paper presents a
comprehensive overview of protocols from all layers of the Open System
Interconnection (OSI) model. The protocols encompass a range of communication
technologies, including ad-hoc, mobile broadband, and fiber-optic cable. All of
these protocols are utilized in the field of intelligent transportation systems
(ITS) and must exchange information at some point. The current development
leads to a much tighter connection between ecosystems that were previously
isolated or not connected. This situation necessitates a comprehensive
understanding of the protocols at all layers to ensure the establishment of
safe and secure applications within the field of intelligent transportation
systems (ITS).
