An interesting subject as to the name of the highway. So far I haven't seen any of the early photos posted that call it the Alaska Hwy. The one Murray posted calls it the Canadian-Alaska Military Hwy or to shorten that you could go to Can-Al or Canal, not to be confused with the Canol Hwy named after the Canadian Oil Pipeline.
Murray may be correct in that the original Mile Zero sign was at the roundabout, it wasn't there for many years in my driving experience. The first driving trip I did through Dawson Creek, in 1962,following the road signs, took me down to the downtown Milepost sign Zero as Eagle shows in his photos. Very nice photos by the way. The first time I remember seening the last photo he posted at the roundabout was in about 1989 as I was driving out of Alaska to the Lower 48.
Still strikes me as strange that some Canadians want to call the highway, after a state in a different country. LOL Of course, over the years I have talked to some Canadians that believe that Alaska is part of Canada and they refer to it as Yukon Alaska Territories. One time I had to see a doctor in Edmonton and he insisted that I must have a Canadian health card since Alaska was a part of Canada. He was an excellent doctor but must have cut class on the day geography was discussed. LOL