What is a potential consequence of using retarders on slippery surfaces?

Using retarders on slippery surfaces can lead to the drive wheels skidding because retarders, such as engine brakes or exhaust brakes, are designed to help slow down a vehicle by creating resistance in the drivetrain. On surfaces that have reduced traction—like ice, snow, or wet pavement—engaging a retarder can cause the drive wheels to lose grip. This loss of traction can result in skidding, making it difficult to maintain control of the vehicle.

Conversely, options like increased fuel efficiency and improved braking capability do not directly relate to the use of retarders on slippery surfaces. While retarders may enhance fuel efficiency in general by reducing reliance on traditional brakes, this benefit can be overshadowed by safety concerns on slippery roads. Similarly, although retarders can improve braking in certain conditions, their use on slick surfaces can undermine stability and control rather than enhance braking effectiveness. Better traction management implies maintaining grip and control, which can be compromised by the use of retarders under adverse surface conditions.