Where must you especially reckon with ice on the roadway?

The correct options for where to especially reckon with ice on the roadway are on bridges and on stretches of road running through forest.

Bridges are typically at a higher elevation than the surrounding terrain, allowing them to cool down faster and form ice before other parts of the road. This can create a hazardous driving situation, especially when temperatures hover around freezing.

Similarly, stretches of road running through forests can be shaded by trees, preventing sunlight from reaching the road surface, which can also lead to ice formation. It is crucial for drivers to be aware of these areas when driving in winter conditions.

Although frequently used stretches of road may also have ice, they do not present the same unique risk factors as bridges and forest roads. Therefore, it's essential to recognize both of the first options to ensure safer driving during winter.