You may want to try white noise (www.JetCityOrange.com/white-noise/), pink noise (www.JetCityOrange.com/pink-noise/), and (my favorite) brown noise (www.JetCityOrange.com/brown-noise/) as well as things like waterfalls, surf, hail storms, etc.
Then again, you may wanna just move to a quiet street. I grew up on a main drag with 4 lanes of traffic and a light rail down the middle a block and a half from the police & fire stations. Guess what? As an adult I *insist* on quiet neighborhoods. I've lived next door to 2 cemeteries. Best neighbors I ever had.