In the USA (and perhaps other countries as well) it has become quite popular for cities to add count down timers to pedestrian signals at major intersections. This is done so that pedestrians approaching the intersection can make a more educated guess at to whether they might cross the intersection safely before the light changes.
In Bangkok, Thailand, many intersections feature a much larger count down timer, which is directed towards both pedestrian and vehicular traffic. Seems like a great idea to let EVERYONE at the intersection know what is coming up. Of course, it is a bit saddening when the light changes in front of you and you see “211” seconds appear on the count down, but I think this definitely is a situation where the more everyone knows, the safer everyone will be.