Why don't busses have GPS for every bus stop?

Instead of worrying if one has to wait anything from one minute to one hour wouldn’t it be easier If transit station’s and transit stops had a digital display telling how much one has to wait… if it is an hour you could walk or go to a restaurant. If it is half an hour then one could go for fast food. Finally if it is a minute then one can wait at the stop.

They tried a paper guide in Edmonton, but I find them difficult to believe seeing that more passengers getting on and off, causing time plus or minus a few minutes effectually throwing off the schedules.

Maybe their is an app for that but I don’t have a smart phone.