Why do the road on bridge freeze quicker?

Bridges freeze quicker than regular roads because they are more exposed to the elements. Bridges have less contact with the ground which helps maintain ground heat, while regular roads are built on soil that retains heat better. Additionally, bridges often have less traffic than regular roads which means that there is less friction to help melt ice and snow. Finally, bridges are often built over rivers or other bodies of water, which can further reduce the temperature of the surrounding area and make it more likely for ice to form.