[240glt]

^ Wildlife, and congestion.

At least on AB1 it's twinned, all 90kph and they have bypasses at the gate so you don't need to wait in line if you're driving straight through. On the Yellowhead through Jasper, you have to wait at the gate to get in, it's single lane each way and the limit drops to 70kph a bunch of times through wildlife areas. In the summer it's ridiculously slow and you have to deal with all the idiots that will literally park their cars on the highway, let their kids run around in traffic so that they can take a photo of a big horn sheep. Driving through Jasper is the single most painful stretch of highway on my regular route from Edmonton to our cabin near 100 Mile House