Ice may be good–but not on roads
In many parts of the world, wintertime means freezing temperatures and icy roads. For saftey reasons and transportation efficiency roads need to be kept as dry as possible. A possible way to avoid icy roads would be to either make sure ice cannot build up, or remove it.
A road surface where ice cannot build up would be ideal. However, there is no such solution at reasonable environmental and financial cost. Chemical treatment of road surfaces to avoid ice build-up is reserved for airports or other critical infrastructural areas where icy road surfaces can have disastrous consequences.
Mechanically removing ice can be made by scraping but it takes quite a huge operation to scrape countless miles of winter roads. Even if snow is pushed making the road clear to drive, the ice will often remain. Furthermore, a fully effective scraping would result in excessive wear of the road surface at an increased cost for tax-payers or road owners.
Another way to remove ice is merely to melt it by use of heat, e.g., built-in heating in the paving. For obvious reasons, this is a too costly method for roads in general, so heated roads are rare and mostly found in city centres.
Scraping and heating will only work temporarily as the ice will build up again (unless there is built-in heating of the road). For more efficient and cost-effective de-icing we must look into chemistry.