Ped Ramps

Way back when before handicap ramps where installed at intersections people who were sight impaired could tell they were about to step into traffic because they would have to step off the curb and into the street, or fall on their face in the slow lane if they didn't realize they were stepping off the curb.
Then after wheelchair ramps were installed the sight impaired people could wander right into traffic and not know it, so the transportation scientist devised a plan to retrofit all the ramps with truncated plates (dimpled surfaces) at a cost ranging from $10,000 to $50,000 per intersection.
My solution at a cost of $25 per ramp, plus labor http://www.goldviolin.com/Motion-Sensor-Croaking-Frog-p/91693.htm
I think 1 frog, solar powered, glued down at each ramp would serve to warn not only sight impaired people but also people who may be txting while walking. 

 AND AS LONG AS WE'RE AT IT, SHOULDN'T WE KEEP THEM IN THE CROSSWALK