Where I grew up in central MA,my hometown was rated "the most hilliest city in the USA ,only San Francisco CA "beat" it as far as hilly terrain,but they never get snow..
We rarely saw any salt used--mostly the DPW dumped sand on the roads,with only enough rock salt to prevent the sand from freezing solid in the sanders..they provided 55 gallon drums of the sand at many intersections on the hilly streets,so motorists had some to spread under their tires,if they got stuck..(most of those roads had stop signs on the uphill intersections,something I never thought was very smart!)..
People KNEW how to drive back then,and if the snow got real deep or ice was an issue,tire chains were the norm,and all the fire trucks,police cruisers and ambulances used them when conditions were tough...most trucks back then were just 2wd,but they seemed to get around pretty well,especially with some sand in the bed for weight..
Today, yuppies freak out at the first few flakes of snow,and they feel invincible in their 4x4 SUV's and drive like the roads are bare,and often end up totaling them,and injuring other drivers or pedestrians..
Then they blame the DPW for failing to keep the roads "bare"..
They "demand" the roads be absolutely bare right after a deep snowfall,so the towns and cities have to spread tons of salt,magnesuim chloride,etc,on the roads,which eat steel faster and worse than rock salt did..
It makes the costs of road maintenance skyrocket,it destroys bridges and concrete--in many ways this is a government sponsored "industry"..it ensures more new vehicles will need to be purchased sooner,keeps the steel industry viable,and increases local tax burdens,keeps construction crews employed...and its not really needed (the salt)..
If people learned how to drive properly and slowed down on slippery roads,they would not have to use salt..
I feel salt often makes roads worse when its below 20 degrees,it melts the snow and then it re-freezes solid,and causes a black ice condition that is much worse than driving on snow is..