| Road Condition | Road Surface | Snow | Ice | Snow Depth | Visibility | Temperature |
|---|
| GREEN | Dry | None or blowing powder | None | None | More than 164 ft (50 meters) | Above 35F (+2C) |
| AMBER | Wet | Packed slush | Patches of black ice and slush | Less than 4 inches (10 cm) | Between 65.5-164 ft (20-50 meters) | Between 30 F (-1C) and 35F (+2C) |
| RED | Flooded | Drifting | Sheet ice | Between 4 and 8 inches (10-20 cm) | Between 50-65.5 ft (15- 20 meters) | Between 10F (-12C) and 30F (-1C) |
| BLACK | Heavily flooded | Heavy drifting | Extreme sheet ice | More than 8 inches (20 cm) | Less than 50 ft (15 meters) | Less than 10F (-12C) |
