Stories the budget tells
Four arcs on the Department of Transportation's money, each assembled from public records. Every figure renders live from the same extracts the rest of the monitor uses, and every claim links its receipt.
Arc 01 · structure × obligation limits
A $114B budget that only chooses to fund $27B
Quote “the DOT budget” and you have to say which number. The one that dominates isn't a discretionary appropriation at all.
A trust-fund obligation limitation is a ceiling on pre-granted contract authority the formula programs may obligate this year — not money Congress appropriates anew. The budget classes it mandatory. At FY2027 the mandatory mass is roughly …× the gross discretionary budget authority, about …% of all budgetary resources. Folding it into “the budget” is how a department that chooses to fund ~$27B looks like it appropriates $114B.
The full structure, drawn to scale, is on the overview.
Arc 02 · FHWA × the trust fund
The largest administration is almost entirely trust-fund money
The Federal Highway Administration is DOT's biggest administration and the clearest case of the structure.
Federal-Aid Highways is financed from the Highway Account of the Highway Trust Fund and runs as contract authority controlled by an annual obligation limitation — classed mandatory, not ordinary discretionary BA. Only the small Highway Infrastructure Program line is general-fund discretionary. The account-by-account breakdown is on the appropriations view.
Arc 03 · USAspending × the topline
Money sent, not money bought
In FY… DOT obligated … across the whole agency (USAspending toptier 069) — but most of that is grants and trust-fund formula apportionments to States, transit agencies, airports, and Amtrak, not procurement.
Unlike the Department of War, DOT publishes award detail without a 90-day OPSEC delay, so the feed trails only by normal USAspending reporting lag. The full feed is on the spending page.
Arc 04 · OMB Historical Tables
A baseline of reauthorizations, with infrastructure spikes
DOT's budget-authority arc since the 1970s is two stories layered together: a recurring surface-transportation baseline reauthorized in multiyear bills, and the extraordinary infrastructure surges that spike above it.
Because the bulk of DOT's money is Highway-Trust-Fund contract authority under obligation limitations, this agency-wide line moves with reauthorizations and supplementals, not with annual discretionary appropriations — which is exactly why the spine keeps it distinct from the discretionary program budget. The series is nominal: OMB's Table 5.2 publishes no constant-dollar basis, and we do not synthesize one.
See the full arc on the history page.
Source: Each claim links inline to its primary source — the DOT FY2027 Budget Highlights, OMB Historical Tables, USAspending, and DOT OIG / GAO audit reports · tone: documented mechanics with receipts — not advocacy · provenance →