Traffic analysis: mixed‑use shift could lower daily vehicle trips but will require intersection fixes
County traffic analysis found a shift from office to residential in the staff scenario would likely reduce daily trips by roughly 1,000–1,400 but would still require targeted intersection mitigation (Route 50 & Waples Mill among the worst); staff proposed lane tweaks and signal changes and noted a grade‑separated interchange remains a long‑term comp‑plan option.
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Fairfax County DOT presented a vehicular analysis comparing the county's existing plan, the adopted comprehensive plan potential, and the staff proposed mixed‑use scenario. Tom Burke said that because residential development typically generates fewer vehicle trips per square foot than office uses, the staff scenario reduces total daily trip generation by roughly 1,000–1,400 daily trips compared with some existing or adopted plan permutations.
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