My father bought a Prius V in 2013.  It has forward radar - when cruise control is on, it prevents you from bumping up on someone - even taking you to a complete stop. Handy if you run into a sudden medical problem. I know someone who had a heart attack while driving - it was the accident, not the heart attack, that killed him.  Unfortunately my father's 2013 model didn't have lane assist.  He bought that Prius at age 83 - along with a swimming membership and new cross-country skis. Hopefully  those three purchases will take him to his next car - maybe a self-driver.