In North America this is an Advisory sign.
It can mean "warning corner" or dead end or similar.
OR
It can advise you that Playground or school zone that is not allways a reduced speed limit.
means no passing zone
A black and yellow striped road sign alerts you to a hazard. It means that there is a danger close to the road up ahead. You should be careful and alert when proceeding.
A yellow sign with two lines typically indicates a no passing zone on the road. This means that it is unsafe to pass other vehicles in that area.
Yellow
It is found in VERY few areas and it means a change in the road from a 4 lane to a 2 lane road.
A yellow sign typically indicates a warning or caution to drivers on the road. It is used to alert drivers of potential hazards or changes in road conditions ahead.
A yellow arrow sign on the road typically indicates that drivers should proceed with caution and be prepared to yield to oncoming traffic or pedestrians.
means nothing Wrong! It means caution. Something requires extra attention. At an intersection, a flashing circular yellow means to take extra caution, and watch for traffic on the cross road (which has a flashing red light). A flashing red light is the same as a stop sign. A flashing yellow arrow means you ma turn in the direction of the arrow, but you must yield to conflicting traffic. If the flashing yellow light is not at an intersection, it either calls attention to a road hazard on an accompanying sign, or indicates that a special regulation indicated on the sign is in effect (School speed limit 20 when flashing).
There is a low place in the road.
The yellow solid line in the middle of the road means that you are to stay on your side of the road, no passing!
In america, the double R road sign means RAILROAD.
It means the road surface is uneven - and may cause damage to suspension.