What is with absolutely psychotic driving on Alberta highways?

We are from Manitoba and here people routinely joke about how our drivers are worst in the country and I thought that true. However we went to Alberta around early May and took the opportunity to visit around. I witnessed some absolutely psychotic driving behavior.

I am driving on the Icefields Parkway, and even going 15 kmph over the speed limit, yet I am still constantly getting tailgated. Got tailgated 4 times while I was atleast 15 above the speed limit if not more, what's worse is that the drivers tailgaiting me REFUSE to overtake when the yellow line becomes dotted. This is a winding mountain road with routine Wildlife warnings (a black bear ever walked across it when I was driving), yet some people have so little common sense that they think tailgating is acceptable behavior in such conditions.

Then driving from Calgary to Edmonton on the the Queen Elizabeth Highway, no one is respecting construction zones. I get speeding on a highway but in a damn construction zone? There was a fair amount of construction happening and everyone is just whizzing past me going over 110-115 with no apparent regard for construction crews or what I am assuming are hefty fines if they do it the same way in AB as they do in MB. I felt like a complete yoyo trying to go the posted speed limit in a construction zone.