Both the National Highway Traffic Safety Administration (NHTSA) and the Insurance Institute for Highway Safety (IIHS) have crash-tested the 2010 Audi A4. Both agencies give the 2010 Audi A4 the highest safety ratings possible.
The 2010 Audi A4 does have an exhaustive list of standard safety equipment. Cars.com says that list includes "six standard airbags," as does Motor Trend, which notes that side airbags for the rear seats are "optional."
Other standard safety features on the 2009 Audi A4 include anti-lock brakes, stability control, traction control, and LATCH child-seat hooks.
Popular Mechanics notes the Audi A4's exotic safety options, such as "active cruise control, lane monitoring and collision warning-not to mention Audi side assist, a radar-based system that warns against vehicles approaching from the rear three-quarter view-often a potential blind spot for drivers." There's also a backup camera, Cars.com reports.
TheCarConnection.com points out that the Audi A4's rear seat also has headrests for all three passengers. Visibility in both the wagon and sedan is quite good, even with those headrests in the upright position.