Why is the co-driver called the co-driver?

[Gemma]

The position of the co-driver is very important for the driver. 1. The co-driver has a navigational role: The driver cannot consult maps while driving, so this task can be taken on by the co-driver. Sometimes navigation devices can also make mistakes, and at such times, the co-driver's navigational role becomes undoubtedly crucial. 2. Observing road conditions: The driver cannot look around while driving to find the destination, but the co-driver can, providing information about the current road and address numbers, etc. 3. Alleviating physical and mental fatigue during the drive: Regularly engaging in conversation with the driver can slow down the rate of the driver's physical and mental fatigue.