The 2017 Nissan Altima carries over unchanged from the previous model year. Halfway through 2017, though, Nissan made some changes to the trim level lineup, eliminating the base and 3.5 SR trim levels. Quality standards and features evolve quickly in the family-sedan segment. A feature that was limited or exclusive just a few years ago — adaptive cruise control, for example — might now be essential for most shoppers looking for a midsize family sedan, and each new entry or fresh overhaul raises the bar.