I also believe this spray is a terrible Idea for many reasons listed above. This morning driving to work was -13 and there was a constant mist spraying off other cars. As soon as it touched my windshield it started to crystallize which blocks your vision immediately. I had to spray my washer fluid almost. The whole drive.
This is a link for the city of Edmonton, please email them with your opinions, some good points made here.
parksandroads@edmonton.ca