Where are you likely to find slippery spots on the road?

Slippery spots on the road are commonly found in shady areas and on overpasses or bridges due to several factors. In shaded areas, the sun does not reach the pavement fully, allowing moisture, such as dew or rain, to remain longer and create slick conditions. Overpasses and bridges can also become icy more quickly than regular road surfaces because of the airflow underneath these structures, which can cool the pavement from all sides. This can lead to dangerous driving conditions, especially in colder temperatures when ice can form.

The other options do not accurately identify consistent locations for slippery conditions. Straight sections of the road typically do not have the same risk factors for slickness as shaded or elevated areas. While mountainous regions can present challenges due to steep grades or curves, they are not specifically known for uniform slippery spots compared to the effects of shade and temperature on a flat surface. Construction zones may have uneven surfaces or loose materials, but they do not inherently possess the same risks as shaded areas or bridges in terms of wetness or icing.