Wednesday, November 24, 2010

driving and seat belts

according to the British Osteopathic association, drivers who fail to wear seatbelts correctly are at risk of injury
While most people are fully aware that wearing a seatbelt saves lives, the majority are not aware of another factor:
the way they sit in a car plays a huge part in their personal safety.


The results of a survey by the BOA has found
over one in ten drivers (13%) sit too far back for their seatbelt to offer effective protection in a frontal crash.
To be effective, the belt should be sitting over the bones of the pelvis and not the stomach preventing internal injuries and in contact with the shoulder to prevent serious neck injury.

Sitting too far from the belt can often lead to 'submarining' - where the occupant slips under the belt which can cause catastrophic injuries.


Almost half, (45%), 15 million, of all UK drivers do not drive in a position where their head is close enough to the head restraint or they sit too far back for their seatbelt to be effective, so that in an accident, they would be at risk of sustaining a serious whiplash injury.

Furthermore, only 6% of people adjust the head restraint regularly, despite the fact that most people travel in a variety of vehicles (as drivers, passengers and in taxis for example) and half of all drivers surveyed (51%) said they never adjusted their head rest at all.


Head restraints work by catching and supporting the head in the event of a rear end crash and so reduce the chance of permanent soft tissue damage. A correctly adjusted head restraint should be as close to the back of the head as possible and as high as the top of the occupant’s head, meaning head movement in relation to their body is reduced as the car and seat is punted forward when hit from behind. In addition the drivers’ seat should be at the correct distance so that a properly positioned seat belt is low across the hips and pelvis, with the shoulder belt firmly across the chest and collarbone.


Receiving a serious chest injury as a result of being hit by an airbag during an accident is also a very real possibility for one in seven drivers (14%) who admitted sitting too close to the steering wheel. Drivers with a gap of less than 12 inches between themselves and the steering wheel when driving are at risk of receiving the full force of an airbag deploying in a crash involving the front of the vehicle.

Airbags have to inflate very quickly (some at over 200 mph) in order to protect the head and chest of drivers and passengers in the event of a frontal crash. Therefore an airbag needs enough space in front of the steering wheel in order to inflate properly. People who are shorter than around 5’' 2” (1.57m) often sit too close to the steering wheel and may be injured by the inflating airbag. A safe distance is around 12 inches – the size of an A4 piece of paper placed lengthways.


In the book super-freakanomics, they reviewed the use of child safety seats, and found that upon testing, that most benefit was in the ages up to 2 years old, above that, many children would be able to use standard belts. It was suggested that better safety would come from designing back seat belts for children, and then maybe attachments for adults.

Reviewing the data like this is critical, to allocate resources to what makes a difference, as opposed to over-legislation, according to the authors.