Arduino car with Extra motor

Hey all,

I have this project and trying to figure out what is the best way to go at connecting the fifth motor so i runs independently.
ideally without adding another motor driver...
any idea would be welcome
thanks !

Please read and use the sticky post "How to get the best out of this forum".
Look at schematics and code.

Does it have to rotate in both directions or just one way?

If you want true independence, just connect the motor to it's own battery and off you go!

This @jremmington drawing should driver a motor.