Getting a street pattern built is rarely just a design question, it's a process question: who has the authority to approve a change, how it typically gets funded, how to find out whether something is already in progress, and how to make a request if it isn't.
This varies by city and state, so this page will aim for a general map of how that process usually works rather than instructions specific to any one place, plus pointers on where to look up your own local rules.
That page isn't written yet. If you're trying to get a specific change made right now, your city or county's Department of Transportation or Public Works is the right place to start asking.
Tip
This page is planned but not yet written. Check the Release History & Roadmap for progress.