Really tells a lot about our modern culture, doesn't it? Some'd argue the general gene pool just too a major hit LOL.
Next up: they'll make an app that would make the signal color appear on the phones themselves. Or a signal sent to the smartphone that turns it off.
Or maybe a Pokemon-shaped traffic warden giving directions amidst heavy traffic. Perhaps that would attract the attention of everybody on the road.
Not that this innovation tackles the real problem in any way, namely bad drivers. Or conversely, idiot pedestrians.