A Joint Vehicle-Vehicle/Vehicle-Roadside Communication Protocol for Highway Traffic Safety

Figure 3

Flowchart illustrating receiving vehicles' behaviors using either V2R communication or V2V communication.

(a) Flowchart of receiving vehicles’ behaviors in V2R communication protocol, where the source vehicle will transmit warning messages to roadside unit until it receives the message with the same event ID from roadside unit while the roadside unit will broadcast messages 6 times

(b) Flowchart of receiving vehicles’ behaviors in V2V communication protocol, where vehicles will periodically broadcast warning messages to surrounding vehicles until it receives the message with the same event ID from behind vehicles