Localized Highway Shields (State & County Routes, etc)
In the U.S., each state has its own highway route number shield. Some states, like West Virginia, also have county route shields that differ from the state route shields. In Pennsylvania, a route like Route 28 would show the Keystone with a 28 on top of it.
A lot of effort is taken in WME to ensure the road names and turn-by-turn instructions match signage. Drivers would benefit by having the same highway shields in their Waze app as they will see on the highway signage as they drive.
Apple has already included this in Apple Maps. It should be relatively easy to implement, and would be a wonderful enhancement to the user experience.
Great thinking! The issue you raised has been addressed in a recent redesign. Hope you like it!