这个标识是什么意思?What does this sign mean?

这个标识是什么意思?What does this sign mean?
桥梁的左侧The left side of a bridge
桥梁的右侧The right side of a bridge
道路的右侧The left side of a road
道路的左侧The right side of a road

橙色黑色斜纹表示桥梁的右侧。白色黑色条斜纹的则表示桥梁的左侧。请记住“白左黄右”