Which condition present on a limited access highway would necessitate an extension of the taper or increased distance of advanced warning signs?

In the context of highway construction and maintenance, horizontal and vertical curves present situations where the geometry of the roadway changes significantly. These curves can impact a driver’s ability to see upcoming conditions clearly and react appropriately. When approaching a curve, particularly if it is sharp or steep, visibility is reduced, and the driver may need additional distance to prepare for the change in alignment or elevation.

Extending the taper or increasing the distance of advanced warning signs in these conditions is essential because it provides the driver with more time to adjust their speed and path, reducing the likelihood of accidents. Adequate warning allows for safe maneuvering through the curves, especially in a limited access highway where traffic flow is typically faster. Properly placed signage and taper extensions can enhance safety by ensuring that drivers are adequately informed about the geometry changes they are about to encounter.

Other conditions like alternating traffic, inclement weather, or nighttime operation may require caution and operational adjustments, but they do not inherently change the physical geometry of the road itself. Instead, they typically involve factors related to visibility, speed, or traffic control, which are managed through other means such as lighting, traffic signals, or speed limits.