Once you pass the washed out area near Medicine Hat, the road should be smooth sailing. Enjoy the novelty of the divided highways, higher speed limits, and fewer bumps in the road in AB.
Once you hit BC, the speed limit drops and some of the locals think nothing of passing under visibility conditions that would scare a prairie stubble-jumper half to death. Beware of wild game crossings around dusk when the critters move a lot.
Try to make a stop along the way that will allow everyone to soak and relax in the hot springs. After a long drive, it is good for what ails you.