When placing advance warning signs, the closest sign to the TTC zone should be approximately how high off the ground for urban streets?

The appropriate height for advance warning signs placed near a Traffic Control (TTC) zone on urban streets is crucial for visibility and effectiveness in alerting drivers to potential hazards ahead. The standard recommendation is that these signs should be mounted at a height between 7 to 8 feet above the ground. This height allows for optimal visibility for drivers and ensures that the signs are noticeable without obstructing views for pedestrians and other vehicles.

Selecting a height of 100 feet for advance warning signs would render them impractical and potentially invisible to drivers, as it far exceeds standard practices and locations for signage. The other height options, such as 50 feet, 75 feet, and 200 feet, are likewise not aligned with established guidelines which favor the 7 to 8-foot range. Overall, adherence to proper sign placement is essential for safety, as it helps in preparing drivers for any changes or obstacles they may encounter in the road environment.