Seatbelts reduce your risk of death and serious injury in a crash
Seatbelts work by holding you in place during a collision, preventing you from hitting the steering wheel, dashboard, or windshield. They also keep you inside the vehicle — ejection from a car during a crash is almost always fatal. The belt spreads the force of impact across your chest and pelvis, the strongest parts of your body, rather than letting that force concentrate on your head or neck.
Every state requires front-seat passengers to wear seatbelts. Most states, including California, also require rear-seat passengers to wear them. The specific rules about who must wear a belt, when, and under what circumstances vary slightly by state, but the basic principle is the same: a seatbelt is your most effective protection in a crash, and it costs nothing to use.
This section of the DMV traffic school course covers how seatbelts function, why they matter, and what the law requires. Understanding these details helps you make safer choices behind the wheel and explains why officers stop drivers who are not wearing them.
Key Takeaways
- Seatbelts reduce the risk of death by roughly half and serious injury by two-thirds for front-seat passengers in passenger cars.
- The lap belt holds your lower body in place while the shoulder belt prevents your upper body and head from moving forward during impact.
- California law requires all front-seat passengers and all rear-seat passengers under age 16 to wear seatbelts; passengers 16 and older in the rear seat are not legally required to wear one, though it is safer to do so.
- Drivers are responsible for ensuring that passengers under 16 wear seatbelts; violations can result in a fine and a point on your driving record.
- Seatbelts only work when worn correctly — the lap belt should sit low across your hips, and the shoulder belt should cross your chest, not your neck or arm.
How a seatbelt protects you during a crash
When a car stops suddenly, everything inside it wants to keep moving forward at the same speed the car was traveling. Without a seatbelt, you would slide forward and strike the dashboard, steering wheel, or windshield. A seatbelt stops that forward motion by anchoring you to the seat frame.
The belt has two parts: the lap belt, which crosses your lower abdomen and hips, and the shoulder belt, which runs diagonally across your chest. The lap belt prevents your lower body from sliding forward. The shoulder belt keeps your upper body and head from pitching forward and hitting the steering wheel or dashboard. Together, they distribute the force of the impact across the strongest parts of your skeleton — your pelvis and rib cage — rather than concentrating it on your head, neck, or internal organs.
Modern seatbelts also work with airbags. The airbag deploys in front of you and cushions the impact, but only if you are held in place by the seatbelt. Without the belt, the airbag can actually cause injury because you are moving toward it at high speed.
California seatbelt laws and who must wear one
California Vehicle Code Section 27315 requires the driver and all front-seat passengers to wear seatbelts. For rear-seat passengers, the law requires anyone under age 16 to wear a seatbelt, regardless of where they sit. Passengers 16 and older in the rear seat are not legally required to wear one, though safety experts recommend it.
The driver is responsible for ensuring that all passengers under 16 are wearing seatbelts. If an officer stops you and finds an unbelted passenger under 16, you — not the passenger — receive the citation. The fine for a first violation is typically $162, though the amount can vary by county. A second or subsequent violation within 36 months carries a higher fine.
There are narrow exceptions. Drivers do not need to wear a seatbelt if they hold a medical certificate stating that wearing one would be unsafe for them. Passengers with similar medical conditions may also be exempt, but they must carry documentation. Taxi drivers and delivery drivers making frequent short stops are exempt under certain conditions, though this exception is rarely used.
Why wearing a seatbelt correctly matters
A seatbelt only protects you if you wear it correctly. The lap belt should sit low across your hips and pelvis, not across your stomach. If it rides up on your abdomen, it can cause internal injuries during a crash. The shoulder belt should cross the middle of your chest and shoulder, not your neck or your arm. A shoulder belt that crosses your neck can cause neck injuries; one that sits on your arm leaves your chest unprotected.
Pregnant women should wear seatbelts with the lap belt positioned below the belly, across the hip bones. The shoulder belt should cross between the breasts and to the side of the belly. Wearing a seatbelt during pregnancy is safer than not wearing one, even though positioning matters.
Children under a certain height and weight need to sit in a car seat or booster seat rather than using an adult seatbelt alone. A regular seatbelt does not fit a small child's body correctly and can cause injury. California law requires children to use an appropriate car seat or booster until they are at least 8 years old or 4 feet 9 inches tall.
What happens if you do not wear a seatbelt
If an officer stops you for not wearing a seatbelt, you will receive a citation. The fine varies by county but typically ranges from $162 to $250 for a first offense. You also receive one point on your driving record. A point stays on your record for three years and can affect your insurance rates.
More importantly, not wearing a seatbelt dramatically increases your risk of death or serious injury in a crash. Studies consistently show that seatbelts reduce the risk of death by about 45 percent for front-seat passengers in passenger cars and by about 50 percent for front-seat passengers in light trucks. They reduce the risk of serious injury by about 50 percent for front-seat passengers in passenger cars.
If you are in a crash and were not wearing a seatbelt, you may also face liability issues. Some insurance policies reduce or deny coverage if you were unbelted at the time of a crash, and a jury in a civil case may view your failure to wear a seatbelt as negligence that contributed to your injuries.
Seatbelts and airbags work together
Airbags are designed to work with seatbelts, not instead of them. An airbag deploys in a fraction of a second and with significant force. If you are not held in place by a seatbelt, you can be thrown toward the airbag and struck by it, causing injury. If you are held in place by a seatbelt, the airbag cushions the impact without causing harm.
Airbags also do not deploy in every crash. They typically deploy only in frontal collisions at moderate to high speeds. In a low-speed rear-end collision or a side-impact crash, airbags may not deploy at all. A seatbelt, by contrast, protects you in any type of crash and at any speed.
Some vehicles have airbags in the side panels and roof rails to protect you in a side-impact or rollover crash. These also work in conjunction with seatbelts. The combination of seatbelt and airbag provides better protection than either one alone.
Common mistakes and misconceptions about seatbelts
One common misconception is that seatbelts are unnecessary for short trips or low-speed driving. Most crashes happen at low speeds and close to home. Seatbelts protect you in crashes at any speed, and the difference between 25 miles per hour and 55 miles per hour is the difference between a survivable crash and a fatal one.
Another misconception is that seatbelts trap you in a burning or sinking vehicle. In reality, seatbelts are straightforward to unbuckle — you press a button and the belt releases when ready. The risk of being trapped is far lower than the risk of being ejected or thrown around inside the vehicle during a crash. Seatbelts save far more lives than they endanger.
Some people believe that holding a child on their lap is safer than putting the child in a car seat. It is not. In a crash, a child on your lap becomes a projectile and can be thrown from the vehicle or crushed between you and the dashboard. A properly installed car seat or booster seat keeps the child secured and protects them far better.
Frequently Asked Questions
Can I get a ticket for not wearing a seatbelt if I am driving alone?
Yes. California law requires the driver to wear a seatbelt at all times while driving, regardless of whether there are passengers in the vehicle. An officer can stop you and issue a citation if you are not wearing one.
What if my seatbelt is broken or does not work?
You should have it repaired before driving. If it is broken, you cannot wear it, and driving without a working seatbelt is a violation. Many auto repair shops can replace a seatbelt assembly for a reasonable cost. If you are renting a vehicle and the seatbelt does not work, report it to the rental company and request a different vehicle.
Do I have to wear a seatbelt in a taxi or rideshare vehicle?
Yes. Passengers in taxis, Uber, Lyft, and other rideshare vehicles are required to wear seatbelts. The driver is responsible for ensuring that all passengers under 16 wear one. If you are an adult passenger, you are responsible for your own seatbelt use.
Is it safer to wear a seatbelt or be thrown from the vehicle in a crash?
Wearing a seatbelt is far safer. Ejection from a vehicle during a crash is almost always fatal. Seatbelts keep you inside the vehicle and reduce your risk of death by roughly half. There is no scenario in which being thrown from a car is safer than being held in place by a seatbelt.
Can I wear a seatbelt over a thick coat or bulky clothing?
It is better not to. A thick coat or bulky clothing can prevent the seatbelt from sitting snugly against your body. In a crash, you can slide out from under the belt or the belt can cause injury because it is not positioned correctly. Wear your coat after buckling the seatbelt, or remove it before driving and place it on the seat beside you.