If you cannot see the end of a curve, what should you assume?

When you cannot see the end of a curve, it is prudent to assume that the curve radius may be decreasing. This is important for a rider's safety because if the road beyond the curve is not visible, there could be unexpected changes in the road's geometry. A decreasing radius means that the curve is becoming tighter, which can catch a rider by surprise if they are going too fast.

Assuming that the curve is sharp and dangerous, while potentially true, does not accurately reflect the uncertainty that comes from lack of visibility. While the curve might be sharp, the rider must prioritize caution and reduce speed without assuming the worst-case scenario. Similarly, assuming that the road is clear beyond the curve can lead to unsafe riding behavior if there are obstacles or other hazards present. Finally, presuming that the speed limit is higher at the curve is misleading, as speed limits typically account for safe navigation of the roadway, and riders should always exercise their discretion based on the conditions, which can vary widely when visibility is restricted.