From the California DMV (https://www.dmv.ca.gov/portal/vehicle-registration/insurance-requirements/):
Types of Insurance
Here are the types of acceptable insurance:Motor vehicle liability insurance policy.
Cash deposit of $35,000 with DMV.
DMV-issued self-insurance certificate.
Surety bond for $35,000 from a company licensed to do business in California.
For information regarding cash deposits or self-insurance, contact DMV Financial Responsibility Unit at (916) 657-6520.
The surety bond to drive on California highways is $35,000. So why do we talk about millions of dollars to fly a 50 pound hang glider?