Alcohol, Drugs, Collisions, and Financial Responsibility
Key Takeaways
- California DUI law covers alcohol, illegal drugs, cannabis, prescription medicines, over-the-counter medicines, and any combination that impairs safe driving.
- BAC limits: 0.08% for drivers 21+, 0.01% (zero tolerance) for drivers under 21 or on DUI probation, and 0.04% for commercial or passenger-for-hire drivers.
- By driving in California you give implied consent to chemical testing when an officer suspects DUI; refusal triggers a one-year suspension and adds penalties.
- After a crash you must stop, assist the injured, exchange information, report injury or death to police within 24 hours, and file an SR 1 with DMV within 10 days when required.
- California's minimum liability coverage is 30/60/15: $30,000 per injured person, $60,000 per accident, and $15,000 for property damage (raised by SB 1107 effective January 1, 2025).
Alcohol, Drugs, Collisions, and Financial Responsibility
California treats impaired driving as a safety risk, not merely a blood-alcohol number. Driving under the influence (DUI) laws apply to alcohol, illegal drugs, cannabis, prescription medicine, over-the-counter medicine, and any combination of these. A drug from a pharmacy can still make driving illegal or unsafe if it affects attention, reaction time, judgment, vision, or coordination. The exam wants you to know that "my doctor prescribed it" is not a defense if the medicine impairs you.
BAC Limits to Memorize
| Driver or situation | Illegal blood alcohol concentration (BAC) |
|---|---|
| Driver age 21 or older | 0.08% or higher |
| Driver under 21 | 0.01% or higher (zero tolerance) |
| Any driver on DUI probation | 0.01% or higher |
| Commercial driver | 0.04% or higher |
| Passenger-for-hire driver (rideshare, taxi) | 0.04% or higher |
The classic trap is assuming 0.08% is the universal limit; it is only the adult, noncommercial threshold. A driver under 21 is illegal at 0.01% under the zero-tolerance rule, and a commercial or passenger-for-hire driver is illegal at 0.04%. Remember too that you can be arrested for DUI below any listed number if alcohol or drugs still impair your safe driving.
California is also strict about open containers and cannabis inside a vehicle. Drivers and passengers may not drink alcohol, smoke, or eat cannabis products while in the vehicle, even when parked on a public road. Open alcohol or cannabis containers must be kept in the trunk or an area where passengers do not sit; the glove compartment does not count as legal storage.
Implied Consent and DUI Consequences
Implied consent means that by driving in California you have already agreed to take a breath, blood, or urine test if an officer lawfully suspects you of DUI. Refusing the test triggers a one-year license suspension (longer for repeat offenders) and adds penalties on top of any DUI conviction. After a DUI arrest, California's Administrative Per Se process lets the officer take your license and issue a temporary 30-day license; you then have only 10 days from the arrest to request a DMV administrative hearing.
A DUI conviction can require a licensed DUI program, proof of insurance via an SR 22 filing, license reissue or restriction fees, and, in many cases, an ignition interlock device (IID) that prevents the engine from starting if it detects alcohol. DUI convictions stay on your driving record for 10 years, so a second offense within that window carries far heavier penalties.
Collision Duties
After any collision, your first legal duty is to stop; leaving the scene is a hit-and-run crime. If anyone is hurt, call 911 immediately. If no one is hurt, move vehicles out of traffic when safe, then exchange information. You must exchange your driver license, vehicle registration, insurance information, and current address with the other driver, with police, and with anyone else involved.
| Situation | Required action and deadline |
|---|---|
| Anyone injured or killed | Report to police or CHP within 24 hours |
| Hit a parked car or property, owner not found | Leave a note with your name, phone, and address; report to police |
| Injury, death, or property damage over $1,000 | File a DMV SR 1 within 10 days |
| An animal is injured | Contact police or the nearest humane society; do not move it |
File the SR 1 even if you were not at fault, even if the crash happened on private property, and even if police filed their own separate report. The driver's SR 1 duty is independent, and failing to file can suspend your driving privilege.
Financial Responsibility and the 30/60/15 Minimums
You must carry proof of financial responsibility (usually liability insurance) whenever you drive and when you take the behind-the-wheel drive test. Under Senate Bill 1107, effective January 1, 2025, California's minimum liability limits rose to 30/60/15: $30,000 for the injury or death of one person, $60,000 for the injury or death of more than one person in a single accident, and $15,000 for property damage. Parents or guardians who sign a minor's application accept financial responsibility for that driver until age 18.
Liability insurance is the most common proof, but California recognizes a few alternatives, summarized below:
| Proof of financial responsibility | What it covers |
|---|---|
| Liability insurance policy (30/60/15) | The standard option; covers others you injure or whose property you damage |
| Cash deposit of $35,000 with DMV | A self-insurance deposit accepted in place of a policy |
| DMV-issued self-insurance certificate | For fleets of 25 or more vehicles |
| Surety bond for $35,000 from a licensed company | A bond that pays claims like a policy |
Remember that liability coverage pays for the other party's losses, not your own car. The exam may ask why you still need it even if you trust your own driving; the answer is that the law protects people you might harm.
Putting the Numbers and Deadlines Together
Impairment, collisions, and insurance share a single theme on the test: each safety idea is anchored to a precise figure. Build one mental checklist so a scenario question becomes a lookup. The under-21 zero-tolerance limit (0.01%) and the 10-day windows recur most often, so over-learn them.
| Rule | The exact figure |
|---|---|
| Adult noncommercial BAC limit | 0.08% |
| Commercial / passenger-for-hire BAC limit | 0.04% |
| Under-21 or DUI-probation BAC limit | 0.01% |
| Days to request a DMV hearing after a DUI arrest | 10 days |
| Hours to report an injury or fatal crash to police | 24 hours |
| Days to file an SR 1 with DMV | 10 days |
| Property-damage amount that triggers SR 1 | More than $1,000 |
| Test-refusal license suspension | 1 year (first offense) |
If a question gives you a person's age, a substance, a dollar figure, or a time, your first move is to match that detail to the right line of this table rather than rely on a general sense of "safe."
Which pair of drivers is violating a California BAC rule on these facts alone?
What is California's minimum liability insurance requirement that took effect January 1, 2025?
After a California collision that injures a passenger and appears to cause more than $1,000 in damage, which actions are required or expected?
Select all that apply