Variable Ride-Height Suspension (VRHS)

Depending on conditions such as vehicle speed and terrain, Variable Ride-Height Suspension (VRHS) raises or lowers the ride height of the vehicle while it is in motion. Some VRHS systems operate automatically, while others require the driver to select the appropriate mode. VRHS systems can have a favorable effect on a vehicle’s likelihood to roll over because they lower the height of the vehicle’s center of gravity and improve its Static Stability Factor (SSF) rating for highway driving.

VRHS systems exist under many trade names, including Electronic Height Control (EHC), Active Height Control (AHC), and pneumatic suspension systems.

How VRHS Works
In general, during off-road, lower-speed conditions, the vehicle will ride higher to allow for increased ground clearance. During on-road, higher speed conditions, the vehicle will ride lower. The vehicle riding lower by several inches is less top-heavy, has a higher SSF, and is less likely to roll over in a crash.

• Cover Page
• Rollover Rating System
• Types of Rollovers
• Causes of Rollovers
• Rollover Airbags
• Rollovers - FAQ
• Electronic Stability Control (ESC)
• Variable Ride-Height
  Suspension (VRHS)
• NHTSA's SUV Rating System
• UCR Class Schedule
• A New Way of Protecting Human Life
• Accident Causing Distractions (Infants)
• ARC Network New Members
• September Training Events
• In The News
• Membership Information

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