Why should you drive and turn slowly on bridges, shaded spots, and overpasses in icy conditions?

• Because they are always icy
• Because they are typically warmer
• Because they may still be icy even if the rest of the road is clear and dry
  Explanation:

  "Approach bridges, shaded spots, overpasses, and turns slowly. They may remain icy after the rest of the roadway is clear and dry."
• Because they have better traction