Icy roads?

Today we had a light dusting but I keep hearing that the roads were terrible. Do they not salt all the roads regardless of the accumulation of snow? I would think with a terrain like this they would salt them during any precipitation with freezing temperatures.

ETA: You all are taking this way too personally as if you are the roads that I am questioning. There's no need to be offended, I'm simply asking what the expectation is and wondering where the tax dollars go if not to infrastructure. I'm used to municipalities over preparing by salting the roads in advance. Y'all are too proud of this nonsense. It's ok to have an issue with and complain about the place that you live.

Update: https://www.yahoo.com/news/pittsburgh-officials-defend-department-public-044100370.html