Highway hypnosis is commonly known as a state of reduced alertness while driving. Whether you call it hypnosis or not, people do enter states of trance-like distraction when driving. This is especially common when the driving is monotonous and predictable.
In the prairie provinces (Alberta, Saskatchewan, and Manitoba), long stretches of highway are common. There are far fewer hills and curves in the flatlands than there are in other areas. This can be good for making time and seem far less daunting than driving in the mountains, but complacency can set in during such drives.
The challenges of driving in the mountains keeps the mind active, but when the driving becomes boring and tedious, make sure you are extra-aware of signs of distraction and of your mind wandering.