I guess I would say this. My mothers house in Las Vegas is by a freeway and I have a great Aunt in Kennisington as well (Canyon home along the 15 overlooking Qualcomm Stadium). Both have sound abatement barriers. My mother’s place has a 12 foot concrete and brick wall and my aunt has the standard glass wall. Both extremely work well and during the day you cannot hear the road noise. However, at night, when everything is quite, you can still hear that slight “whirring” sound of the freeway. This is when it becomes the most upsetting. Consider that.
One thing of note. My aunt only has 4 foot high glass (or maybe its polycarbonate) windows and the amount of noise it reduces is unbelievable but you can still hear that “whir” at night.