RydARWhat goes into a curve warning.
Road shape, a simple formula, and your position.
Open the mapRoad data
Bends are measured from the Arkansas GIS Office road lines.
Suggested speed
Radius, banking, and friction give a range.
Timing
The app speaks up about 12 seconds ahead. It stays quiet if the bend is behind you or too close.
V = √(15 · R · (e + f))
- V speed, mph
- R radius, ft
- e banking
- f friction
A 300 ft paved curve gives about 24–27 mph.
A guide, not a posted limit. Gravel, weather, tires, or GPS error can call for slower. Read the code.