I can't tell and have tried to find out, so I decided to ask. In the Prius Two 2017 and 2018, what are the different safety features. In the 2018, most everything comes standard, but I can't find out what the 2017 Prius Two has as Standard. The 2016 you have to go up to the four to get all the safety stuff, but 2017? I don't know.
Behold, our Knowledge Base section 4G Prius Features & Specifications (2016-?) | PriusChat (oh crap, I need to update it with the 2018 features PDFs)
In the 2017 Prius 2 (purchased mine a year ago) the full safety package was standard in the second half of the year. Although I'd have to look, I don't think there is much difference between the late 2017 and the 2018's.