I don't know if it helps you, but as someone who's very annoyed by road noise, one thing I've found makes a huge difference is replacing the window stripping with as much and as thick foam as you can fit. Most apartments are built with thin stripping in the first place and routine maintenance almost never replaces it. The first time I did it, my apartment bedroom at the time went from the loudest I've ever had to the quietest I've ever had.