Answer: In my experience the poplars really are not usually the best choice, they are brittle and do break in snow and ice and wind storms. Six feet is very narrow for trees, their branches spread outward and cause trouble with vehicles passing beneath them and their roots need to spread wider than the branches, thus causing trouble with the pavement. Very few trees can reach that height and stay so narrow. Arborvitaes include some cultivars that are columnar and can reach, say, 20 feet while staying narrow. They will however take many years to grow that tall. Your local professional nursery staff may have some other suggestions based on a more detailed understanding of the growing conditions, the space available and your design goals. Perhaps a fence between the driveways combined with awnings on any windows would solve the view problem?
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