Where I live some highways have a sign that says: > CAUTION: SOLAR GLARE IN THE A.M. It's serious enough to warrant its own road sign, but its not as much of

Where I live some highways have a sign that says: > CAUTION: SOLAR GLARE IN THE A.M. It's serious enough to warrant its own road sign, but its not as much of a realistic issue on a divided highway, so maybe this road didn't have such a sign. This type of danger is probably what the article is describing.