What is the most appropriate sign display for a curve on a rural collector highway with a speed limit of 50 mph, where the comfortable speed is determined to be 35 mph?

The most appropriate sign display for a curve on a rural collector highway, where the speed limit is 50 mph but the comfortable speed is assessed at 35 mph, is to use a curve sign with an advisory speed plaque.

This choice is suitable because it effectively communicates to drivers that a curve is present and provides guidance on a safe speed to navigate that curve. The advisory speed plaque informs motorists about the recommended speed of 35 mph, which is significantly lower than the posted speed limit of 50 mph, helping to enhance safety by encouraging drivers to slow down as they approach the turn. This becomes particularly relevant in scenarios where the geometry of the curve may pose risks if taken at higher speeds.

Using a simple curve sign along with an advisory speed plaque is a well-established practice in traffic management, particularly on rural collector highways, where drivers may not expect sharp turns. This combination is effective in promoting safer driving behavior while still retaining the overall speed limit for the roadway. The design prioritizes safety without enforcing a lower speed limit, thus allowing for a balance between vehicle flow and safety measures.