In most of the regions where the Pittsburgh Left is common (I grew up in Massachusetts, and thought it was just how you drive until I moved out to California), adding a protected left is not feasible. The roads are single-lane, barely the width of a single car, and property rights extend right up to the side of the road. (Similarly, in many cases sidewalks are infeasible because there's always some homeowner along the road who refuses to cede their land.) The properties themselves are usually residential, and there will be hundreds of them alongside the road.
It's very different from the 3-lane boulevards with wide setbacks, protected turn lanes, and commercial zones all owned by the same developer that you'd find in the West or South. The roads in the Northeast U.S. are former cow paths, and they are about as wide as you would expect a horse-drawn wagon to be. (They also don't form any sort of grid system and frequently meet at 5- or 6-way intersections, which is a whole other issue.)
It's very different from the 3-lane boulevards with wide setbacks, protected turn lanes, and commercial zones all owned by the same developer that you'd find in the West or South. The roads in the Northeast U.S. are former cow paths, and they are about as wide as you would expect a horse-drawn wagon to be. (They also don't form any sort of grid system and frequently meet at 5- or 6-way intersections, which is a whole other issue.)
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