Directional Triggers

I was experimenting with this and had an idea on how to make this work. Sometimes there are only red light cameras or speed cameras in one direction on a road so I think a directional trigger could be useful. So I figured out you could make a directional trigger by limiting the proximity and location of the POI. If you put the location on one side of the road and limit the proximity distance to something very narrow, like 5 meters it will only trigger when traveling in one direction. This is harder to do with a small road, but if you have a divided highway or multilane road it works pretty well.