Research
Network Time Protocol- NTP is intended to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC).[1]:3 It uses the intersection algorithm, a modified version of Marzullo's algorithm, to select accurate time servers and is designed to mitigate the effects of variable network latency. NTP can usually maintain time to within tens of milliseconds over the public Internet, and can achieve better than one millisecond accuracy in local area networks under ideal conditions. Asymmetric routes and network congestion can cause errors of 100 ms or more.[2][3]
-Wikipedia "Network Time Protocol"
Example usage of Raspberry Pi, GPS and NTP to have real-time knowledge
Example usage of GPS unit by Adafruit to get GPS clock interface
MIT Tech Review- New car-to-car Communication Systems
https://www.technologyreview.com/s/534981/car-to-car-communication/
**DSRC/Raspberry Pi Research information
http://sandhill.com/wp-content/files_mf/whitepapervehicle_to_vehicle_communicationeinfochips.pdf
Vehicle to Vehicle Communications
http://www.cas.mcmaster.ca/~rzheng/course/CAS765fa13/WSN_WVN.pdf
https://www.sparkfun.com/datasheets/GPS/NMEA%20Reference%20Manual1.pdf
How our GPS send signals