On what kind of road surface are vehicle wheels most prone to locking during braking?

[SanChase]

Vehicle wheels are prone to locking when braking on surfaces with low friction coefficients. Here are the relevant details: 1. Examples: For instance, on icy or snowy surfaces commonly encountered, the reduced friction causes the braking force between the brake pads and discs to exceed the friction between the tires and road, resulting in wheel lock-up and skidding. 2. Wheel lock-up: This occurs when the brake clamps the tire so firmly that the tire stops rotating relative to the brake, causing it to slide against the road surface. 3. Classification: Wheel lock-up includes dynamic and static types. Dynamic lock-up refers to situations where - during driving - front wheel lock-up causes loss of steering control, rear wheel lock-up makes the vehicle prone to skidding with minor lateral forces, and simultaneous lock-up of all wheels makes the vehicle slide straight ahead. Static lock-up occurs when parked vehicles experience wheel immobilization, potentially causing one or more wheels to slip upon restarting, preventing normal operation.