Proponents of a new Potomac River bridge crossing, the so-called “techway,” have long claimed that “U-shaped commuters” are clogging the American Legion Bridge and that this justifies a new bridge to get them directly from homes to jobs in Montgomery and Fairfax/Loudoun. Yet the new study shows that at most 2000 commuters out of 24,679 Maryland and Virginia cars counted are making what could be called a U-shaped commute…