At what temperature are icy roads most slippery?

Related questions

1. How accurate is 10 day weather forecast?
2. Where does the Weather Channel get its data?
3. Are we going to get a lot of snow this winter?
4. How accurate is Groundhog Day?
5. Does Google Earth show real time weather?
6. How do I add weather to Google Maps?
7. Is Google or Apple Maps better?
8. How does Farmer's Almanac predict weather?
9. What is the difference between maps and Google maps?
10. How accurate are 10 day forecasts?

Tags

1. #slippery
2. #temperatures
3. #roadway
4. #reach
5. #below
6. #warranted
7. #digits
8. #freezing
9. #temperature
10. #single
11. #extra