I’d just widen I-95 to at least 4 free lanes in each direction between Woodbridge and I-295. Of course, thanks to the privately run express lanes in the highway’s median, VDOT would have to pay a princely sum to Transurban just to do so, due to the “non-compete” clause.
Why? I-95 was widened to 3 lanes in each direction in 1985 and that’s good enough by Virginia standards.