What part of the road freezes first?

Here is the question :

WHAT PART OF THE ROAD FREEZES FIRST?

Here is the option for the question :

Sidewalks
Bridges
Curves
Driveways

The Answer:

And, the answer for the the question is :

Bridges

Explanation:

[STC0011318]. If you happen to live in a snowy climate, you already know that bridges ice over first. You should take it easy when crossing one of these icy bridges because there may be patches of ice. Because there is no barrier between the cold air and the road surface, bridges are often the first to ice in the winter.