Rules 1-4 should be considered "critical:" failure to follow them will likely result in a "failed" urban form (i.e., one that is unwalkable, unadaptable, etc).
Rules 5-10, however, can be thought of as "nice to haves" or "next level aspects". They can help elevate an urban form to a higher standard. These rules are still in the process of codification. We list them below as a preview of what’s to come with our ongoing work.
Rule #5: The Art of the Plan
A discussion on the overall street network of a neighborhood or city. Comparing the relative pros and cons of grid irons, City Beautiful, medieval patterns, etc.
Rule #6: Parks and Civic Institutions
The size, placement, and interaction of parks and civic institutions within a street plan.
Rule #7: Existing Natural Features
How should street plans be designed with respect to geography, topography, solar orientation, rivers and creeks, etc?
Rule #8: Autonomous Systems
How should street plans be designed with respect to interstate highways, railroads, airports, power easements, etc?
Rule #9: Extra-Territorial Considerations
The extent of a master street plan is limited to the issuer’s jurisdiction (e.g., within the boundary of a city). How do the outlying areas interact with such a plan? And vice versa?
Rule #10. (Reserved For Discovery)
And because we’ve been conditioned to think in "10s."