The NWS Pittsburgh has been emphasizing their concern for icy roads tonight. Melted snow could freeze resulting in icy spots and black ice, so drive (and walk) with care if you are out tonight or in the morning. 

From the NWS Pittsburgh:

We sant to reiterate that now the snow is out of here, the key message over the next 12 hours is potential for icy spots on the roads tonight and into early tomorrow morning. 

With a lot of the roadways still wet from snowmelt, and no sun to evaporate what has already melted, overnight air temperatures crashing into the low 20s will allow for those wet areas to refreeze.  We expect that road surface temperatures will dip below freezing around 9pm or so tonight. 

Jeff, WB1AAL