Pedestrian crossing signs are usually a square standing on one corner or you may call it a fat diamond shape, but some are triangles with the point at the top and the long side a the bottom -- like an upside down Yield sign.
Diamond in the US, Circle in the UK.
triangle
It could be a plus (+) sign
You should warn them and report them to the police right away
It is red and white shaped like a cross.
You will stop and give the pedestrain the right-of-way.
Uncontrolled railroad crossing warning signs typically include a basic "Railroad Crossing" sign, which features a white "X" shape with the words "Railroad Crossing" printed on it. Additionally, there may be a yellow circular sign with a black border indicating the crossing ahead, and sometimes a sign indicating the number of tracks. These signs serve to alert drivers to the potential for trains crossing the road, emphasizing caution and the need to stop and look for oncoming trains.
A deer crossing road sign typically features a yellow diamond shape with a black silhouette of a deer in the center. This sign alerts drivers to the possibility of deer crossing the road in that area, helping to prevent accidents. Some signs may also include additional text or symbols indicating the frequency of deer crossings.
no
no, its a warning sign
A warning sign
Warning sign.