While the RL hasn't at all been tested by the National Highway Traffic Safety Administration (NHTSA), it's been put through the paces by the Insurance Institute for Highway Safety (IIHS) in all of its categories, and while it gets top 'good' results in frontal, side, and rear tests, it didn't do well at all in the new roof-strength test. In fact, the 2011 RL has the worst results in the roof strength category of any model tested—indicating a higher-than-typical chance of injury in a rollover, which is, admittedly, less likely in a low sedan like the RL.
But all the standard safety features are here, and more. Six airbags are standard, plus active front headrests, electronic stability control, and anti-lock brakes, and radar-based cruise control and automatic curve-following headlights are available. Acura's Collision Mitigation Braking System also detects potential rear-end collisions from its location behind the front grille, warns the driver, then initiates automatic braking, using millimeter-wave radar technology to keep track of vehicles ahead. CMBS is bundled with adaptive cruise control (ACC), which adapts speed and distance to the vehicle in front.