Yellowhead Highway

Have seen these across 2 provinces and what is with the yellow head?

As it turns out, the highway is named for the Yellowhead Pass, the route chose to cross the Canadian rockies.  The pass, and the highway are named after a fur trader and explorer named Pierre Bostonais.  He had yellow streaks in his hair, and was nicknamed "Tete Jaune" (Yellowhead)

aaaah