The biggest money mistake is suing or settling with the wrong entity while the real deadline runs out. People hear "government" and assume the city automatically pays, or they take a fast insurance check before figuring out who controlled the signal.

A common Dubuque example: two cars collide at an intersection after the light stays dark or gives conflicting signals. One driver gets a call from an adjuster pushing a year-end settlement for the car. Later, the driver learns the crash also caused ER bills, missed work, and therapy. Then comes the real problem: that signal may have been handled by the City of Dubuque, or it may have involved the Iowa Department of Transportation if the intersection was on a state route. Those are not the same claim.

Yes, you may be able to make a public agency pay, but only if you can show negligent maintenance or operation of the signal. The myth is that cities are untouchable. They are not. But Iowa gives public entities defenses, especially if the argument is about a planning choice rather than a maintenance failure.

General rules in Iowa:

• If it was a city-controlled light, a claim may fall under Iowa's municipal liability rules, and the lawsuit deadline is usually 2 years.
• If it was a state-controlled signal on a state highway, claims against the state usually must be filed first with the Iowa Appeal Board under the Iowa Tort Claims Act, also generally within 2 years.
• Evidence matters fast: crash report, photos of the dark or malfunctioning light, 911 calls, witness names, and any repair records.
• Your claim can include more than car damage: medical bills, lost wages, future treatment, and pain and suffering.
• Do not assume the first check covers everything. A property-damage payment can leave you stuck with later injury costs.

That matters even more around Dubuque bridges and winter black ice, where insurers love blaming weather instead of a failed signal. Weather can be part of the crash. It does not automatically erase a bad-light claim.