Roadway cases against public entities frequently involve a private co-defendant, such as a negligent driver, alongside the public entity. California's comparative fault system under Civil Code section 1431.2, known as Proposition 51, limits a defendant's liability for non-economic damages to its own percentage of fault, which means the allocation of fault between the driver and the public entity is often the central damages question at trial. Public-entity dangerous-condition cases also live or die on expert testimony connecting the physical condition of the property to the standard of care a reasonable public entity should have met. Traffic engineers, pedestrian safety experts, and municipal budgeting experts each serve a distinct function, and selecting them or coordinating a team that covers each should happen at the outset of the case, not after the entity's answer identifies its defenses.