On a practical level................

Implementation requires planning and management. Getting suppliers to adhere to drawings and layouts, and timelines, is an art form. Good suppliers are overstretched and, as a result, increasingly inconsistent and unreliable. Success should never be left to their hands, however good they are.

Roadside signs need foundations and electrical feeds. Often, infrastructure is in place before sign design and locations are established.

Developers, third party operators and retails will all demand a share of voice. Guidelines are essential to regulate use and prevent clutter and erosion of your own identity.