It takes a minimum of 3-5 mph increase in speed to cause a vehicle to go out of control.

• A. True
• B. False
• C. Not always
• D. Only on ice

Answer: (B)

There isn’t a fixed minimum speed increase that will always push a vehicle out of control. Vehicle stability depends on how much grip the tires have just when they need to provide traction for acceleration, braking, and steering, and that grip isn’t the same in every situation. Road conditions, tire tread and inflation, weather (wet, icy, or dry), vehicle load, and how you steer or brake all change how much speed you can safely gain or lose before the car starts to slide or drift. On a slick surface, even a small change in speed can break traction and cause a loss of control; on a dry, well-maintained surface with good tires you might tolerate more speed change, but there’s still no universal threshold. The key idea is that risk isn’t tied to a specific mph number.