The horn,
The signal lights,
The brake lights,
The back up lights,
Flashing the high beam headlights,
A modem
wave
CAN(Controller Area Network) is standard designed to allow micro-controller and devices to communicate with each other within a vehicle without a host computer
by email and other radio devices
use horn
there is an app called pouncer
IBM produces drivers for all kinds of technological devices such as printers, computers, laptops, POS, Networking Devices, Peripherals, System Storage and various other devices.
What percent of drivers involved in lane change crashes claim they did not see the other vehicle?
BUSEach channel, called a bus, allows the various devices both inside and attached to the system unit to communicate with each other
No, other than the GPS devices, there are no other vehicle tracking systems that are in use. You can see the latest inventions at en.wikipedia.org/wiki/Vehicle_tracking_system
Servers
serial port to communicate between CPU with other devices such as printer