ABS standard. Side and head protection air bags standard from 2007. ESC standard from 2010. Forward collision warning and automatic emergency braking available from 2010, standard from 2017.
The Prius's 52 mpg overall is a phenomenal achievement. It's a significant improvement over the previous generation's 44 mpg overall.
There's more going on with the fourth-generation Prius than just fuel sipping, though. It still packs the traits Prius owners have come to love, such as hatchback versatility and just enough quirks. The improved handling and more sculpted styling are meant to inject a younger persona to the Prius.