[NEW] Guidance for turn instruction overrides

[nzahn1]

@AlanOfTheBerg

@PleaseDriveFast

Do we also need to consider reviewing AGC guidance? In many places we’ve been adding 90 degree mDLs to a force a turn right rather than exit right instruction. The override might be a solution to match AGCs to their real geometry. Thoughts?

Yes! I believe this is also good. Though for some very long turn lanes, I don’t think a “turn right” 800+ feet before the actual turn is a good idea. Examples are welcome.

We may want to take care to keep departure angles around ~20° to preserve the ability to close roads from the app (due to the pitiful nature of the app’s road closure tool).