WASHINGTON (AP) — Federal regulators and the auto industry are taking a more lenient approach than safety advocates like when it comes to phasing in automatic braking systems for passenger cars, according to records of their private negotiations. [...] safety advocates say voluntary agreements aren't enforceable and are likely to contain weaker standards and longer timelines than if the government had issued rules. Meeting minutes obtained by The Associated Press of three of the meetings that NHTSA has held with automakers since October that show the government is considering significant concessions. Besides NHTSA, meeting participants included 16 automakers, two auto industry trade groups and the Insurance Institute for Highway Safety, the insurance industry's safety research arm. More than half of those crashes could be avoided or mitigated by automatic braking or systems that warn drivers of an impending collision, NHTSA estimated. NHTSA announced last year that it will include automatic braking and other collision-avoidance technologies in its five-star safety rating program to encourage automakers to more widely adopt the technology. In an unusually pointed criticism, the National Transportation Safety Board, which investigates accidents and makes safety recommendations, said in a report last year that "slow and insufficient action" by NHTSA to develop performance standards for automatic braking and collision warning systems and to require the technologies in cars and trucks "has contributed to the ongoing and unacceptable frequency of rear-end crashes."