Does double glazing with thick acoustic glass work?

Our living room is very, very noisy due to outside car traffic. At the moment we only have a 3mm thick glass (single glaze) in the window and it lets in all the noise. I am looking at paying a small king’s ransom to have double glazing with 16.8mm acoustic glass from Pilkingtons put in. Because of the shape of the window alcove secondary glazing is not an option. Does anyone know if it will work?