NHTSA study shows that the percentage of people involved in rollover
accidents was 21% in 2002, which was 17% in 1994, 1995, and 1997. The
average yearly percentage of incapacitating and fatal injuries for
restrained occupants was determined by analyzing the rollover data
obtained from the FARS query and was found to be 35%.
Rollover accident is where a vehicle turns over on its side or roof.
The main cause for rolling over is turning too sharply while moving too
fast. When the combination of the force acting in the direction
opposite to the one it is turning is combined with gravity or g-force
acting downwards is applied to the center of vehicle's mass falls
outside of the rectangle formed by the wheels, the vehicle starts to
Big vehicles such as such as 18-wheeler tractor-trailer trucks,
commercial vans, minivans and conversion vans can easily rollover. The
tendency for a vehicle to rollover is dependent on the g-force required
to roll the vehicle. G-force is created when a vehicle negotiates
Following chart illustrates the force required to rollover different kinds of vehicles
|Truck (Fully loaded)
||0.4 or lower
|Half empty tanker
It is almost impossible to generate the required force of 1.3 g for
the cars while turning around a corner, whereas it is easy to generate
0.4 g's required to cause the trucks to rollover. It has been observed
that trucks can generate approximately 4 g's from quick steering
maneuvers. A quick maneuver behind the wheel in an attempt to avoid
collisions, as well as cornering too fast can generate much larger
g-force than the required 0.4 g's to cause the trucks to rollover.
Under special circumstances trucks can rollover at the speed as low as
5mph while negotiating a corner. Improperly loaded trailer may cause
the truck to rollover. If the truck leaves the road, in an instinctive
reaction the drivers usually attempt to return the vehicle back on
track, many times this causes truck rollovers. As a good practice the
driver should straighten out the vehicle and bring it to a stop, get
out and evaluate the situation. They should attempt to return the truck
to the road as slowly as possible only if it appears safe to do so. If
you have any doubt, call a tow truck to get you back on the road.
If you are injured in a truck rollover accident, contact us for a free consultation to discuss your case with an expert.