It isn&#x27;t just driving in the rain that&#x27;s a problem; puddles after the rain are, too.  From an article 2&#x2F;6&#x2F;2016:<p>&gt; Some objects are hard to figure out, though. Heavy rain, for instance, confuses the cars. Google postponed The Bee’s first planned test ride because heavy rain had left puddles in the road, and the cars aren’t sure how to react when the car ahead splashes water into the air. If confused, the cars are programmed to just pull over and stop.<p><a href="http:&#x2F;&#x2F;www.sacbee.com&#x2F;news&#x2F;local&#x2F;transportation&#x2F;back-seat-driver&#x2F;article58899473.html" rel="nofollow">http:&#x2F;&#x2F;www.sacbee.com&#x2F;news&#x2F;local&#x2F;transportation&#x2F;back-seat-dr...</a>