Final answer:
Cruise control should never be used on slippery roads, as it can lead to loss of vehicle control. Proper winter tires are essential for creating sufficient friction on icy roads. More friction is also beneficial in sports like basketball for better player control.
Step-by-step explanation:
The driving accessory that should never be used on slippery roads is cruise control. Cruise control can cause the vehicle to accelerate at a time when you need to be able to control your speed manually to respond to road conditions. When the roads are slippery, it is critical to maintain control over the vehicle's speed and braking to prevent skidding or losing control.
Aside from the proper tires that create more friction on icy roads, another example where more friction is desirable could be in sports such as basketball, where players wear shoes with rubber soles designed to increase grip on the court. More friction between the shoe and the floor allows for better control and agility, reducing the risk of slipping during rapid movements.