Traffic control devices city liability claims arise when a municipality's choices, or failures to choose, regarding crosswalk markings, traffic signals, warning signs, and related roadway infrastructure contribute to a pedestrian or vehicle collision. These cases sit at the intersection of California's dangerous condition of public property statute and the specialized body of law governing the design immunity defense, and they require a distinct analytical approach compared to cases involving purely physical hazards like potholes or vegetation.
835
Government Code section for dangerous condition of public property
830.6
Design immunity statute these claims must overcome
Claims involving traffic control devices typically proceed under Government Code section 835, requiring proof that the roadway or intersection configuration constituted a dangerous condition, that the condition proximately caused the injury, and that the public entity created the condition or had notice of it. These cases are frequently complicated by the design immunity defense under Government Code section 830.6, since decisions about where to place a crosswalk, whether to install a signal, and how to configure sightlines and markings are often the product of an approved engineering design. Design immunity requires the public entity to show a causal relationship between the plan or design and the alleged dangerous condition, discretionary approval of the design by an authorized body or employee prior to construction, and substantial evidence supporting the reasonableness of the design at the time of approval. A plaintiff can defeat this defense by showing any one of these elements is missing, and can also defeat immunity, even where an approval and reasonable design once existed, by showing that changed circumstances following approval created a dangerous condition the public entity had notice of and failed to correct.
One of the most powerful ways to defeat a design immunity defense in a traffic control device case is to establish that what was actually constructed does not match what was actually approved. Design immunity protects only the specific design that received discretionary approval, not any subsequent modification, deviation, or construction error that produced a different final condition. If discovery reveals that the crosswalk markings, signal timing, or intersection geometry that existed at the time of injury diverged from the officially approved plans, whether through an unapproved field modification, a construction error, or simply the existence of a different, uncertified set of plans that was actually followed, the immunity defense can collapse entirely, regardless of how reasonable the original approved design may have looked on paper. This exact issue arose in litigation involving a young child struck in a marked crosswalk, where investigation revealed a second, unsigned set of crosswalk plans that matched the as-built condition of the intersection, differing from the officially approved design the city relied on for its immunity defense.
Even where a design was properly approved, a public entity can lose design immunity if it later has notice that changed physical conditions, increased traffic volume, or a pattern of prior incidents rendered the design dangerous and fails to remedy it. This theory is especially relevant at long-standing intersections where traffic and pedestrian volume have changed since approval.
Traffic engineering experts evaluate whether a crosswalk's location, signal timing, sightline distances, and signage complied with applicable standards, and whether any deviation between approved plans and as-built conditions would have been apparent to a reasonably diligent public entity. They can also testify on industry-standard practices for periodic review at high pedestrian volume locations.
Attorneys should request both the officially approved design plans and any as-built survey or construction records for the specific location, looking for discrepancies that defeat immunity, while also investigating the intersection's collision and complaint history to support a changed-conditions theory.
In litigation over a dangerous crosswalk configuration that led to a child's traumatic brain injury, thoroughly investigating the gap between approved design and actual construction proved decisive.
The case behind this page
The full story of the design immunity fight and the $23,015,000 resolution.
Read the full caseRelated proof
How prior complaints and inspection failures establish that a city knew about a hazard.
How notice is provenRelated breakdowns from this case and our dangerous condition practice.
We take roadway and intersection cases against public entities as counsel or co-counsel and pay statutory referral fees.
Refer a caseIt is a claim alleging that a municipality's choices regarding crosswalk markings, signals, or warning signage created a dangerous condition of public property that contributed to a collision.
Design immunity under Government Code section 830.6 can shield a public entity from liability for a properly approved traffic control design, but the defense can be defeated by showing the design was not properly approved or that what was built differs from what was approved.
Yes, under the changed-conditions theory, a public entity can lose design immunity if it later has notice that changed circumstances, such as increased traffic or a pattern of prior incidents, have rendered the original design dangerous and fails to correct it.
