Up here in the Interior of Beautiful BC, Interior Roads (the private contractor who "takes care" of your roads in our area) has another approach to the sand on road thing...and here is a summary of their typical response procedures employed to address wintry road conditions:
They used big stones on the road, mix it with salt, and load it into their fleet of trucks. Then they wait for a good dump of snow to come along. They proceed to Tim Hortons to iron out the final tactical details necessary to implement their strategic plan to keep our highways and byways safe for all.
At the appointed hour (when the coffee pot goes dry), the trucks then move out with a sense of purpose, spreading this mixture of rocks and salt all over the top of the freshly-fallen snow. After a few hours of logging trucks, pickups, and cars packing it all down into a nice sheet of ice - with windshield-smashing interludes, which tend to disperse the rocks into the ditches after they take out the windshields and a number of spin-outs into the ditches (and the ditches can be deep in BC) - they send out the plow trucks, which all have their blades raised to "just above" the road surface so as to prevent any bothersome and expensive blade and road surface wear. Mind you, it could also be a safety issue, as a blade placed down tight to the road surface would "grab" pieces of poorly-maintained and broken asphalt protuding above the otherwise perfect road surfaces, thus endangering the lives of the snow truck operators, or at least making the CD skip a beat or two.
They then all proceed back to Tim Hortons to nourish their bodies and minds and await the next snowfall so they can go forth and pursue their mission of road maintenance and serve the residents of the area. And the windshield replacement shops. And the tow truck operators.
Ah, it's a wonderful winter lifestyle out here in the BC Interior...as long as you don't have to drive.