Watershed can also mean a ridge, like that formed by a chain of mountains, which sends water to two different rivers on either side.
A road sign that reads "Watershed" typically indicates the boundary of a specific geographic region where all surface water drains to a common point, such as a river, lake, or ocean. It signifies that the area behind the sign is part of a larger water system and may highlight the importance of protecting water quality and conservation efforts in that area.
dont throw trash on the road.
Its a Stop sign
In america, the double R road sign means RAILROAD.
that your driving into a box
It is a worded warning sign
The straight road you are on ends at a "T" intersection (road that goes right and left).
No passing zone!
That there is a 10% slope in the road ahead, meaning it is very steep.
That's the maximum permitted speed on that section of road.
It's a guard rail warning sign
Farm to market road
The shoulder refers to the area of the road just outside the main road. A soft shoulder sign means that the shoulder is literally softer than the actual road.