Five-point harness
Five-strap seat belt used in racing and child seats.
The five-point harness is a seat belt design with five straps anchored to a vehicle's frame. It was created to improve safety during crashes and is required in NASCAR because of the sport's high speeds. The harness is also used to secure infants and young children in child safety seats.
The design is preferred for its high level of protection. It uses two shoulder straps, two hip straps, and one crotch strap, all meeting at a central buckle. This holds the driver firmly in the seat, protecting the upper body. A drawback is that the driver's head is not secured by the harness alone.
To address this, helmets with restraints are used. In NASCAR, a HANS (head and neck support) device prevents brain and neck injuries during crashes or sudden speed changes. The device uses tethers connecting the helmet to a collar worn by the driver, which in turn is secured by the shoulder straps, rather than attaching directly to the vehicle.
Helmet straps are designed to stay horizontal so they do not block the driver’s vision. Some designs need no extra apparatus to keep straps out of sight. The straps are made of shock-absorbing material, similar to those used for climbing or working at heights. They use woven nylon that requires up to 475 pounds of force to tear. Stretchable straps allow the brain to slow down gradually, reducing the risk of brain injury from impact with the skull, while preventing the head from moving too far forward and causing neck injury.
For children, the five-point harness is used in both forward-facing and rear-facing seats. It works on the same principle of holding the passenger tightly with five straps, but is built for smaller bodies. Many injuries in survivable crashes happen because child safety seats are used incorrectly. To help caregivers, the USA National Child Passenger Safety Board oversees the National Child Passenger Safety Certification Training Program, which trains and certifies technicians and instructors. Common risks include improperly installed safety seats, children left in hot cars, and teen drivers.
- type
- safety device
- primary use
- automotive and child safety seats
- mandated in
- NASCAR race car competition
- number of straps
- 5
- strap locations
- two at shoulders, two at hips, one at crotch
- also used for
- securing infants and young children in child safety seats
Lore & Background
The five-point driver's harness is preferred as a safety mechanism for its high amount of safety compared to other designs. It consists of five straps: two at the shoulders, two at the hips, and one at the crotch, all connecting to a buckle release mechanism. This holds the driver's body tight in the seat, protecting the upper body from injury, though a downside is the insecurity of the driver's head. To address this, different helmet models have been designed, including a helmet restraint equipped in some five-point harness seats to prevent brain and neck injury. In NASCAR, this protects the driver in a crash or sudden velocity change. The apparatus, called a HANS (head and neck support) device, uses tethers connecting the helmet to a collar worn by the driver, which is then secured by the shoulder straps.
Reader's Guide
The five-point harness is significant for its role in increasing safety in high-velocity motorsports and in child transportation. In NASCAR, it is mandated due to the high speeds involved. The harness's design tightly holds the occupant, but the head remains vulnerable, leading to the development of helmet restraints like the HANS device. Helmet straps are made of shock-absorbing material, with woven nylon requiring up to 475 lbs. of force to tear; stretchable straps allow the brain to slow down to avoid brain damage while preventing the head from moving too far forward. For children, the five-point harness is used in forward-facing and rear-facing seats. Phil Wilson stated it 'should be a default standard' when children are in a motor vehicle. The USA National Child Passenger Safety Board maintains a certification training program to assist caregivers, as incorrect use of child safety seats has led to injuries in survivable accidents. Common issues include improperly used or installed safety seats, children left in hot cars, and teen drivers.
Did You Know?
- The five-point harness has been mandated in NASCAR race car competition due to high velocities.
- The HANS device is a head and neck support mechanism used with the harness.
- Helmet straps require up to 475 lbs. of force to tear.
- Phil Wilson stated the five-point harness for children 'should be a default standard' in motor vehicles.
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