IIHS Ranks Volvo XC90
at Top in Whiplash Protection Test



OF 2005

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Volvo XC90

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16th January, 2006

In an American test of whiplash protection systems in SUVs and light trucks (utes), the Volvo XC90 is one of few models to achieve the top rating.

An independent American research and safety institute, the IIHS (Insurance Institute For Highway Safety) used a crash test dummy to register loads on the neck during a simulated impact from the rear. This is the first time the IIHS has carried out a dynamic test with SUVs and trucks.

The test was carried out in two stages. First, the seats were measured to determine the head restraint’s geometry and to determine the preconditions for protecting the head of a man of normal height.

Only seats with good or acceptable head restraint geometry proceeded to the second stage, the dynamic crash test. Here, a moving platform was used to simulate a situation where a car standing still was hit from behind by a vehicle of the same weight driving at a low speed, about 32km/h.

The test method and the evaluation criteria have been developed within the framework of broad international co-operation between experts in preventive whiplash injuries (IIWPG – International Insurance Whiplash Prevention Group).

Only six of the 44 vehicles tested proved to offer effective protection against whiplash injuries. The Volvo XC90 is one of the best. The overall assessment includes both the seats’ measured geometry and the results of the dynamic test.

The IIHS emphasises that effective protection against whiplash injuries is an important factor for reducing both human suffering and the cost of rehabilitation. Collisions from behind are very common and neck injuries are the most common type of serious injury arising from car accidents.

The Movement of the Head and Upper Body Must Be Synchronised
According to the IIHS, the key to effective protection is that the seat occupant’s head and upper body should move in harmony during the collision sequence. Whiplash injuries are usually caused by the head not keep up with the body as it jerks forward under the force of the impact. For this reason, the seat and head restraint must interact to support the head so that it accelerates together with the upper body.

It is also important that the head restraint is sufficiently high and positioned close to the head. “Volvo’s head restraint is designed in precisely this way,” explains Ingrid Skogsmo, Director of the Volvo Cars Safety Centre. “WHIPS, Volvo’s Whiplash Protection System that is fitted as standard in all new Volvo cars, is designed in such a way that it ensures that both the head and torso move together, and also that acceleration forces are limited.”

Volvo’s advanced whiplash protection design is one of the reasons behind the excellent test results, and this is confirmed by the IIHS.

Volvo’s Whiplash Protection System (WHIPS)
In Volvo’s Whiplash Protection System, the front seats and their headrestraints are designed to provide uniform support for the entire back and head during the collision sequence. In addition, a bracket fitted between the seat backrest and the seat cushion helps the seat to absorb the incoming energy, thus reducing the acceleration forces in a rear-end impact.

This is done by the weight of the occupant’s body pressing the backrest rearward in a simultaneous horizontal and reclining position. This motion dampens the incoming forces rather like when a person catches a thrown ball, thus reducing the stress exerted on the occupant’s body. It also reduces the subsequent forward motion.

Volvo XC90

Other Volvo news: here.

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