What is the maximum projection of a sign over the right-of-way on an arcaded structure?

The maximum projection of a sign over the right-of-way on an arcaded structure is typically established to ensure safety and compliance with regulations governing public spaces. A projection of 600 mm is common in many jurisdictions as it allows sufficient clearance for pedestrians while still providing visibility for advertising purposes. This limit effectively balances the need for signage with the necessity of maintaining a safe environment for traffic and foot traffic alike.

The other options suggest larger projections, which could encroach upon pedestrian pathways and create safety hazards, such as obstructing movement or visibility in crowded areas. This makes the 600 mm projection not only a regulatory measure but also a practical one in urban design and public safety considerations.