What Actually Decides a Chicago Double Parking Ticket Appeal

City records show about 52% of mailed challenges to double parking tickets end with the driver found not liable — and the reason you win or lose is almost always the same one.

Built from Chicago’s own hearing records, obtained under the Freedom of Information Act. Last updated August 26, 2026.

About 52% of mailed challenges to Chicago double parking tickets end with the driver found not liable. That's based on 1,032 decided cases from 2023 through 2025 — mail-in challenges only. If you have one of these tickets in your hand, those are real odds. But how you write the letter matters enormously, because the data also shows what separates the wins from the losses.

What wins

When a driver is found not liable, the hearing officer has to write down why. Chicago uses a fixed list of codified reasons, so the breakdown is exact.

"Violation is Factually Inconsistent" drove 82% of every not-liable ruling on these tickets — 443 cases out of 540 wins. That phrase means the officer looked at the citation and found something about it that didn't hold together: the description of where the car was, when the officer observed it, or what it was doing didn't match a violation they could confirm.

"Prima Facie Case Not Established by City" covers the remaining 13% of wins. That means the city didn't meet its basic burden — the paperwork or evidence it submitted wasn't enough to establish that a violation happened at all.

Both of these reasons point in the same direction: the wins are mostly not about a clever argument. They're about a factual gap in the city's own case.

What loses

The losses have their own pattern, and one of them is preventable.

The big loss reason — 81% of liable rulings — is simply that the officer found the violation happened. The city's case held up.

But look at the second row. Eighty-seven drivers — 18% of everyone who lost — were recorded as "Failed to Select one of the Codified Defenses." Those drivers didn't lose on the facts. The officer never got to the facts. The letter they mailed never named one of the defenses the ordinance actually recognises, so the challenge was turned away on a technicality before their argument was even weighed.

That's a hard way to lose. You took the time to contest the ticket. You wrote the letter. And the case was closed against you before anyone considered what you said.

What this means for your letter

The city's online contest form — available at chicago.gov — lists the codified defenses. Before you write anything, look at that list. Your letter needs to select at least one defense from it. Describing the situation in your own words is not the same thing, and the records show it costs drivers the case.

After you pick your defense, attach whatever document supports it. A signed citation and a photo are what the officer has on the city's side. A bare denial — "I wasn't double parked" with nothing attached — gives the officer nothing to weigh it against. Whatever your defense is, the document makes it real.

If your argument is that the violation description is inaccurate — the location, the time, what the car was actually doing — that's the most common path to a not-liable ruling in these records. Be specific. Don't explain why you needed to stop there, and don't ask for leniency. An explanation that admits the car was where the officer said it was hands the case to the city.

Do this today

The ticket doubles 25 days after the city decides you're liable — so the deadline matters whether you're contesting or paying. If you're going to mail a challenge, go to chicago.gov, find the Department of Administrative Hearings contest page, and check the codified defense list before you write a single word. Pick the one that fits. Then attach something that supports it.

SELECT disposition, COUNT(*) AS cases FROM hearings WHERE violation_code IN ('0964110A1', '0964110A2', '0964110A')
      AND contest_method = 'Mail'
      AND CAST(substr(issue_datetime,
  instr(issue_datetime, '/') + 1
  + instr(substr(issue_datetime, instr(issue_datetime,'/')+1), '/'), 4) AS INTEGER) BETWEEN 2023 AND 2025
      AND disposition IN ('Not Liable', 'Liable') GROUP BY 1sql

SELECT reason, COUNT(*) AS cases
    FROM hearings
    WHERE violation_code IN ('0964110A1', '0964110A2', '0964110A')
      AND contest_method = 'Mail'
      AND CAST(substr(issue_datetime,
  instr(issue_datetime, '/') + 1
  + instr(substr(issue_datetime, instr(issue_datetime,'/')+1), '/'), 4) AS INTEGER) BETWEEN 2023 AND 2025
      AND disposition = 'Not Liable'
    GROUP BY 1 ORDER BY cases DESCsql

SELECT reason, COUNT(*) AS cases
    FROM hearings
    WHERE violation_code IN ('0964110A1', '0964110A2', '0964110A')
      AND contest_method = 'Mail'
      AND CAST(substr(issue_datetime,
  instr(issue_datetime, '/') + 1
  + instr(substr(issue_datetime, instr(issue_datetime,'/')+1), '/'), 4) AS INTEGER) BETWEEN 2023 AND 2025
      AND disposition = 'Liable'
    GROUP BY 1 ORDER BY cases DESCsql