Canada is hoping to score with new technology that warns of black ice
on the roadways.
Each sensor is the size of a hockey puck, and once embedded in
pavement, turns red when the road temperature reaches the freezing point. The
color change signals road crews to switch to chemical road treatments.
Canada has other black-ice warning systems, but they are costly
compared to the approximate cost of $20 per puck, as reported in the Toronto Star.
The sensors are manufactured by Traction Technologies in Kamloops,
British Columbia, and are part of a pilot project in Toronto, Peel, Whitby,
Windsor, Niagara and Waterloo regions of Ontario; Calgary; Edmonton, Alberta;
and the highway departments in British Columbia and Saskatchewan.
The pucks, according to the Star article, can be calibrated for lower temperatures, including the mark of about
16 degrees Fahrenheit, when regular road salt becomes ineffective. Most highway
departments switch to chemical road treatments under those conditions.
The goal of the pilot project is to net a few cost savings and improve