The first time Holly learns that Gail has road rage they're on their way to Bruce Peninsula (Gail was already annoyed that Holly was able to convince her to spend a weekend hiking and sleeping in a cabin.)
"Do you see this asshole, Hol? What does that bumper sticker say? 'I drive the speed limit?' Congratu-fucking-lations, but I don't so move out of my goddamn way!" Gail shouted to the mini-van crawling in front of her while driving down the winding, one lane highway towards their first weekend getaway.
Holly laughs, grabs Gail's hand from the center console, and makes a mental note of it, Gail Peck doesn't do the speed limit.