Confusion at the zebra crossing

I finally figure out what's the cause of confusion at the zebra crossings in Singapore. Click here for previous entry on the same topic. Look at these two pictures. The first picture is a picture of a zebra crossing in Singapore, while the other one is from a city in the US. Can you find the difference? That's right,it's the stop sign. In the US, it's mandatory for all motorists to stop first before driving over the zebra crossing. Pedestrian right of way is made clear by the presence of the stop sign. While in Singapore, it's not clear who has the right of way. I am sure traffic law states that pedestrian has right of way. However, the lack of street signs bring about major confusion on the street.