Driving a car requires licensing though. I needed to go through a driving class, 24h of driving with a certified instructor, and six months of supervised driving under provisional permit before being granted my driving license. That's pretty rigorous considering how easy driving is.

Granted, these requirements loosen after a person reaches a certain age. But they still need to demonstrate an ability to drive and knowledge of the rules of the road before being licensed.

A CDL takes a lot training to earn, and you have to demonstrate a clean driving record for the previous 10 years.

Safely driving is far harder than safely cutting hair and the consequences of failing at it are incomparably worse than the consequences of failing at safe hair cutting.

Driving is one of the most dangerous things that ordinary people engage in. You're hundreds of times more likely to kill someone driving than doing any other activity, by virtue of the relative deadliness of motor vehicle accidents, and how much driving the ordinary person does.

That you need 1,600 hours of instruction to cut hair in California, far in excess of what any jurisdiction requires to get a license to drive, is the most blatant demonstration of the injustice of occupational licensing.