searching for my soul wrote:
If it was obvious as you are approaching you'll be opening a whole other can of worms. Yes, the sign might have been blocked by the truck but wouldn't it be blocking your vision in seeing that there is an oncoming car in said intersection? I would have immediately slowed down and yielded through the intersection if a truck was blocking my line of sight in a different direction of the intersection.

This. and yes there are intersections with no signs at all, it's very common in older neighborhoods here.