Passive Safety

Restraint Device : Whiplash Injury Lessening (WIL) Concept Seat

The WIL Concept Seat helps reduce risk of whiplash neck injuries in lower speed rear-end collisions

Approximately 53% of passenger car injury accidents in Japan are rear-end collisions, and approximately 90% of these injuries are neck injuries, including whiplash.
Seats incorporating the WIL (Whiplash Injury Lessening) concept are designed to cushion the passenger's head and chest simultaneously, helping to minimize injuries in lower speed collisions.

Seats incorporating the WIL (Whiplash Injury Lessening) concept are designed to cushion the passenger's head and chest simultaneously, helping to minimize injuries in lower speed collisions.

Injury patterns of accidents involving driver/passenger

Sourse : ITARDA (Institute for Traffic Accident Research and Data Analysis)data (2005)

Main injury areas in rear-end collisions causing injury to driver/passenger

Sourse : ITARDA data (2005)


Whiplash injuries occur when the head and torso move in opposite ways during a rear-end impact.
Toyota re-assessed the positioning of the seatback frame and headrest and also increased the rigidity of the seat frame in designing the WIL concept seats.
THUMS was used to confirm the effectiveness of the WIL concept seats in helping to reduce whiplash injury risk for occupants in lower speed rear impacts.

WIL Concept Seat alleviates impact to the neck

  • ① When driver is hit, the back sinks into the seat.
  • ② Supports the head and body simultaneously to help minimize whiplash.
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