I’m autistic with relatively high sound sensitivity. I’m wondering if another autistic person in this community used any soundproofing in an apartment that actually reduced noise coming from a busy street. There are a lot of different products out there and I don’t want to buy something that doesn’t work.
You could see if you can get some old carpeting or rugs for cheap or free to hang along the wall facing the street. They have two features that block sound: complex geometry, and mass.