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Fairfax County explains annual reports, spot checks and trip-count rules for TDM proffers

Transportation Talks / Fairfax County Department of Transportation · July 23, 2026
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Summary

County planners described the annual reporting process for proffers, their use of spot checks and manual counts, and the conditions required for valid trip counts (school in session; Tuesday through Thursday).

RJ Wiersma and Matthew Koprowick described how Fairfax County monitors compliance with TDM proffers through annual reports, data cross-checks, and occasional spot checks. RJ said the annual report covers activity, budget, and trip counts; planners cross-check reports against proffer language to confirm alignment.

On-site validation sometimes includes manual counting: "We sit there with a little clicker counting the in and out for the site," Koprowick said. Planners also clarified conditions for acceptable counts: counts must be made when school is in session and on Tuesday through Thursday, and federal-government operations being open can materially affect counts in this region.