Round signs give orders, normal triangle signs give warnings and rectangular signs give useful information (the background colour of these describes the road by the way).
that your driving into a box
dont throw trash on the road.
Its a Stop sign
In america, the double R road sign means RAILROAD.
A sign with arrows on the road indicates the direction that vehicles should follow.
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