What sign height is required when adjacent to a sidewalk?

The correct answer is grounded in the safety regulations set by agencies like the Manual on Uniform Traffic Control Devices (MUTCD). When placing signs adjacent to sidewalks, a minimum height requirement is put in place to ensure they are out of reach for pedestrians and do not obstruct visibility. A sign height of 7 feet is specifically recommended in many jurisdictions as it allows for safe passage for pedestrians, reducing the risk of accidents or injuries. This height also accommodates other pedestrians, including those using mobility devices, ensuring accessibility and compliance with regulations.

The other heights listed, while potentially safe in some contexts, do not meet the standard that emphasizes pedestrian safety and unobstructed pathways as effectively as the 7-foot requirement does.