When starting down a long downgrade, what should influence your speed choice?

When starting down a long downgrade, the choice of speed is significantly influenced by the road and weather conditions. These factors affect how well your vehicle can maintain control and respond to braking. For example, wet or icy conditions can reduce traction, making it necessary to go slower to prevent skidding or losing control. Similarly, road conditions such as potholes or loose gravel can also dictate a more cautious approach.

While the steepness and length of the hill are certainly important considerations for determining the appropriate speed, the overall safety and control of the vehicle are more directly impacted by the current road and weather conditions. This is why it's crucial to assess the environment before descending a hill, allowing for adjustments in speed to ensure safe navigation.