What is the difference between road narrowing and bridge deck narrowing?

[MarianaFitz]

Road narrowing and bridge deck narrowing differ in their scope and nature. Differences in scope: The road narrowing sign is placed at an appropriate position before a narrow road and is divided into two-side narrowing, right-side narrowing, and left-side narrowing. Bridge deck narrowing refers to the narrowing of both sides of the carriageway, mainly indicating a symmetrical narrowing along the road centerline; the right and left sides represent unilateral narrowing. These signs are used to warn drivers to be aware of the narrowing carriageway or road ahead and to slow down and yield when encountering oncoming vehicles. Differences in nature: Two-side narrowing is a traffic safety sign used to warn drivers that the carriageway or road ahead is beginning to narrow on both sides, requiring them to slow down and yield when encountering oncoming vehicles. Width narrowing refers to a traffic safety sign placed at an appropriate position before a narrow bridge where the bridge deck width is less than the road width and the bridge width is less than 6 meters.