App displays speed colour to yellow on turns.

In Australia we have advice sign posts "yellow triangle" that suggest
a comfortable speed for a corner (on corners that are closer to hair-pin than straight).

The route navigation current speed would show white (normal), yellow (over suggested speed) or Red (over legal speed limit)

Some possibilities:
- Waze servers auto assign "suggested speed" value based an approximation of centripetal force that considered angle between two segment "points" and ignores slope.
- Waze editor allows a road to have an assigned "suggested speed" based on road signage suggestions (which take into consideration average user comfort, slope, turn angle.

Benefits:
- Route calculation calculates based on suggested speed, resulting in increased accuracy of route recommendations.
- road segments where its not comfortable for average drivers to drive at the legal limit (due to all sorts of speed slowing features: Speed humps, one car only chicane, potholes, Drain dips, pedestrian shared roads, weather affected roads [snow, heavy rain, sand], steep descent, narrow roads, narrow dual carriage bridges)