Many years ago I was riding to school in a school bus, the bus driver stopped at a stop sign and then proceeded turning left on the the major cross road hitting a passing VW bug and crushing it against a retaining wall on the far side of the road. The VW had the right of way as it was on the major road and didn't have a stop sign. The bus driver just didn't see it even though the intersection high very good sight lines with no obstructions. The VW was only 2' wide crushed against the wall but fortunately its driver was ambulatory and relatively unhurt.