What might happen if you use the retarder on slippery roads?

Using the retarder on slippery roads can lead to the drive wheels skidding. A retarder is designed to slow down the vehicle's speed without having to use the brakes, which can be beneficial under normal conditions. However, when the road conditions are slippery due to ice, snow, or rain, engaging the retarder can create a loss of traction. This is because the retarder applies resistance to the drive wheels, and if those wheels lose grip on the slick surface, they can slide or skid. This loss of control could result in dangerous situations, such as the driver being unable to steer properly or maintain control of the vehicle. Therefore, it's crucial to avoid using the retarder in such conditions to ensure safety.