Even better would be to just fix the light timing, and make the roads safer for all pedestrians, not just those using this app. This is a blatant band-aid on a more significant problem.
Fixing the light timing is harder than it sounds. Too long for pedestrians (When there is no demand and lots of wasted time), encourages drivers to not fully comply with the signals. At least with this app, it minimised the extended crossing time to only when needed. The drivers can then see the mobility impaired pedestrian crossing and confidence remains with the timing.
