Where must you especially reckon with ice on the roadway?

You answered correctly. Ice forms particularly easily on bridges because cold air can surround the entire structure, causing the roadway to cool faster than regular road sections. Forested stretches are also risky because they are shaded from sunlight, which prevents ice from melting quickly. Frequently used stretches are actually less likely to have ice, since the constant movement of vehicles helps warm the road surface. In future, remember to be especially cautious for ice on bridges and shadowed forest sections, regardless of general traffic.