In almost every dangerous road case we file, the entity's answer says the same thing: the design was approved, so the entity is immune. Some firms hear that and close the file. We hear it and start discovery, because design immunity protects far less than public entities claim it does. The Vertanous Firm has recovered more than $60 Million for injured Californians, including a $22.6 Million jury verdict against the City of Los Angeles, and immunity defenses were part of that fight too.
The Short Answer
Design immunity comes from Government Code section 830.6. The idea, stated generally: when a public entity's authorized decision-makers considered a plan or design for public property, approved it in advance, and had substantial evidence that the design was reasonable, courts will not let a jury second-guess that considered decision after an injury. The doctrine exists so that every intersection in California is not redesigned by hindsight, one lawsuit at a time.
Fair enough, as far as it goes. The plaintiff-side point of this page is how far it goes, which is much less far than the government's lawyers say. The defense has elements, the entity carries the burden of establishing them, and the immunity has boundaries and an expiration condition built into the statute itself. This page is part of our complete guide: dangerous condition of public property.
The Elements
Design immunity is an affirmative defense, and in general terms the entity must establish three things:
Every element is a real requirement with a real failure mode. Public works projects span decades, agencies merge and reorganize, and records vanish. The plan produced in discovery may not cover the feature that hurt you, may not carry an authorized approval, or may not match what was actually built. When any of that is true, the shield does not attach.
Example: A driver is badly hurt where a curve meets an unprotected drainage channel. The county pleads design immunity and produces roadway plans from the original project. The plans show the curve, but the sheet covering safety barriers was never completed, and the approval signature on the set belongs to a clerk, not the county engineer.
Conclusion: The defense has element problems everywhere. The produced plan does not address the barrier decision that caused the harm, and the entity cannot show discretionary approval of that feature by anyone with authority to give it. On this record, design immunity should not defeat the case, and the fight returns to where it belongs: whether the roadway was a dangerous condition.
The Boundaries
The most common misuse of the defense is stretching it over conditions that were never designed at all. Three boundaries matter in almost every case:
Maintenance is not design. The immunity protects the drawing, not the neglect of what was built. A pothole is not a design. A dead streetlight is not a design; our page on streetlight and signal failures covers that scenario in full. Vegetation swallowing a stop sign, a faded crosswalk, a crumbling shoulder: these are conditions the entity let happen, and no approval meeting ever blessed them.
The plan must cover the danger. An approved plan for a road is not an approval of everything near the road forever. If the dangerous feature was outside the plan's scope, added later, or simply never considered, the causal link between approved design and injury is missing.
As built must match as approved. When construction deviates from the approved drawings, the entity is no longer defending its considered decision. It is defending an improvisation, and improvisations get no immunity.
Told the road was "approved" and there is nothing you can do? Get a second opinion from a firm that has beaten a city at trial.
Free Case ReviewLosing the Immunity
Government Code section 830.6 contains its own escape valve, and it is the one entities most hate to discuss: changed conditions. Stated generally, a design that was reasonable when approved can lose its immunity when the physical conditions around it change enough to make it dangerous in actual use, the entity has notice of the danger, and it has had a reasonable opportunity to fix it or to warn the public, and does neither.
Roads do not live in the year they were drawn. A rural intersection becomes a retail corridor. A two-lane collector absorbs freeway detour traffic. A crosswalk drawn for one school now serves three. And the entity's own files record the transformation: traffic counts, collision reports at the same location year after year, resident complaints, and internal studies that were funded, drafted, and shelved. When the paper shows the entity watched a design turn dangerous and kept the old drawing as its answer, the immunity conversation changes entirely.
Example: An intersection designed in 1985 for light residential traffic now fronts a shopping center built in 2015. Left-turning drivers sight-guess across three lanes because the design never included a protected turn phase. The city's own collision data shows the same broadside crash at the same corner, year after year, and a traffic study recommending signal changes has sat unfunded for six years. A jury could find the city kept an obsolete design with full knowledge of what it was doing at that corner.
Conclusion: This is the changed-conditions scenario the statute contemplates. The design may well have been reasonable in 1985, but the city had notice that conditions transformed it into a hazard, had years of opportunity to act, and did not. On facts like these, design immunity can be lost, and the case proceeds on the dangerous condition itself.
How We Fight It
Because design immunity is the entity's burden, our work is making the entity actually carry it, element by element, document by document:
Not a description of it. The approved drawings, every sheet, every revision, and the record of what was built against them.
Who approved this design, under what authority, on what date, with what materials in front of them. Authority and timing are elements, and decades-old projects frequently cannot prove either.
Site inspection and measurement against the drawings. Deviations end the defense.
Collision data, complaints, service requests, and studies. This is where changed conditions, notice, and opportunity to fix are proven, and it doubles as the notice evidence the underlying case needs anyway.
None of this matters if the claim was late. The six-month government claim runs while you deliberate, and our page on the government claim deadline explains that unforgiving sequence.
If you are referring counsel weighing whether to keep a roadway case with a design immunity defense in it, this is exactly the category we co-counsel: short deadlines, immunity motions, and trial risk. Start at our referral page, or call (626) 888-2223 and talk to Tom directly.
If we don't win, you don't pay.
The consultation is free. The representation is on contingency. If there is no recovery, you owe no attorney fee.
Questions We Hear Every Week
A defense created by Government Code section 830.6. In general terms, a public entity may be immune from liability for an injury caused by the plan or design of public property when that plan was approved in advance by a body or employee with discretionary authority, and substantial evidence supported the reasonableness of the approval. It protects the entity's considered design decisions from being retried by a jury. It does not protect everything that goes wrong on public property.
No. Design immunity is a defense the entity must plead and prove, not a wall around every roadway case. It reaches only injuries actually caused by an approved design, and it never excuses a failure to maintain what was built. Entities assert it in nearly every intersection and roadway case, including many where it does not apply. The answer to the defense is investigation, not surrender.
Three things, generally: a causal relationship between the approved plan and the accident, discretionary approval of that plan before construction by someone with authority to give it, and substantial evidence supporting the reasonableness of the design when approved. Each element is a real requirement. Old projects have missing records, plans that never considered the feature at issue, and construction that does not match the drawings, and any of those can defeat the defense.
Yes. Government Code section 830.6 itself contemplates that an approved design does not stay immune forever. Where changed conditions have made the design dangerous in actual use, and the entity had notice and a reasonable opportunity to fix or warn, the immunity can be lost. Traffic patterns change, neighborhoods grow, and collision histories accumulate. A drawing approved decades ago is not an answer to a corner that has been injuring people for years.
No. Design immunity protects design decisions, not neglect. A pothole, a failed streetlight, a sign hidden by overgrown vegetation, or a crumbling curb is a maintenance condition, not a plan someone approved. Entities sometimes stretch the defense over conditions it was never built to cover, and part of our job is pushing it back to its actual boundaries.
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