Wrong forum. But to sum it up, you can't. You need a couple miles of woods and even then.... This is why you dont move beside a busy street. Been there done that. A 30' wall may help some and could be ready w/in 5 yrs

That's an acid soil lover. I wouldn't do it unless well-amended and morning sun/under an existing pine. Dan

I can reccommend also Leatherleaf Viburnum, Pieres Japonica, leuocothoe (rainbow is a nice hybid variety), Acuba, Mahonia Aquaflorim, they have developed some new Camelias which are more cold hardy, you could look into them. If you get a cornus florida (native to america) be sure to get a named variety because they tend to be more resistent to powdery mildow and other diseases. I have several Kousa dogwoods (native to korea I think) 'Milky Way' has done well for me. I have both native and kousa in my yard and I get a prolonged bloom because the kousa blooms just after the natives. You might try planting some bleeding hearts mixed in with Hostas. You can get the spring bloom from the bleeding hearts, which will then go dormant in summer (unless you get a hybrid named 'Luxuriant', which blooms all spring and well into summer) and the Hosta leaves will fill in the bare spot left by the bleeding hearts. The same can be done with blue bells and anemones. Astilbe, lobelia cardinalis, huechera, tirarella, lenten roses, japaneese peonies, are nice plants for shade as well. I love shade gardening because of the foliage combinations which are possible. Keep in mind that I am in the southern edge of Zone 7, you should check the hardiness in your area.

Often, seemingly conflicting sources may both be correct. For instance, growth rate in warmer, more southern areas may be much greater than in colder climates. Also, conditions in one part of a single hardiness zone area may be strikingly different than those at another, in another part of the country. Mature size may refer to different ages when discussed by different sources. There is no true standard for "mature size" data. All that said, I find the Missouri Botanical Garden's Plant Finder site pretty useful and generally accurate. www.missouribotanicalgarden.org I almost never use only one site. I try to get a consensus view from three or more sources.