To pass this week's challenge, you have to let your son drive.
Driving a car is a big responsibility. Letting your son drive the car is both fun and a great way to show him that you trust him. You can have him sit on your lap and turn the wheel while you work the pedals if you're not comfortable with him sitting in the seat by himself.
Take the time to teach him how to operate a car and how to drive it. Then let him actually make it go.
CYA - Be smart. You're the adult and are responsible for your safety. Follow the law.