@Min "Signs had been put up to help all of the many drivers who don't get" (insert any highwaycode rule here)
Signs proliferate like cancer cells. I just don't get either why so many signs are needed when there is a general rule already. Every traffic island now has a white/blue arrow sign "drive around this island on the left side". Oh, you didn't see the sign? So make it an illuminated plastic bollard.
A few weeks ago I was driving out in the countryside late at night. The road was dark, empty, and of course you drive slowly and carefully as there were flooded bits, road defects, blind summits, deer or badger crossing, that's just what you expect in the country at night.
But then, around a corner, I was suddenly blinded by several huge warning signs on both sides of the road and an arrangement of yellow flashing lights. For a moment I couldn't see anything at all and thought I've driven into a UFO crash landing site or something like that.
When my eyes had adjusted to the sudden brightness, I saw that the light display was in fact warning me of a slight bend in the road.