Apple’s foray into autonomous cars could eventually put rental car companies out of business, but for now, Apple Car rumors are doing wonders for Hertz which just saw its stock price skyrocket thanks to some new rumors.

Apple finally received permission from the California DMW to test self-driving cars on public roads this week, but spotting an Apple Car in the wild won’t be easy for fans.

Instead of making its own automobile for the streets, Apple will simply be testing its autonomous vehicle software using other company’s cars. Apple has permission to drive only three cars, so seeing them on the road might be tough.

Here’s what to look for.