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The Alaska Highway was built during World War II to connect the lower USA to Alaska through Canada. It begins in Dawson Creek, British Columbia and runs to Delta Junction, Alaska. The Alaska Highway is in a constant state of flux being widened, rerouted and straightened out in various places. An indication of this work is the changing length of the Alaska Highway, when opened in 1942 it was some 1,700 miles long yet in 2012 it had shrunk to less than 1,400 miles. Some of the bypassed sections are still in use either as local roads or as recreational areas (for an example see the page relating to the Kiskatinaw Bridge). Originally noted for being a rough, challenging drive the Alaska Highway is now completely paved (though the frequent road works put you back onto very rough gravel and test your teeth fillings).
Points of interest along the Alaska Highway are marked through an informal system of historic mileposts and these are used where appropriate through the various pages describing the Alaska Highway. For example Whitehorse in the Yukon is at Milepost 917 and Delta Junction, at the end of the Alaska Highway is at Milepost 1422.
The most useful source of information I found for the Alaska Highway (and indeed for the whole Northern expedition) was the publication “Milepost” which is updated annually. More on this comprehensive publication can be found here. It is a trip planner for highway and ferry travel to Alaska, the Yukon, British Columbia, Alberta and Western Northwest Territories and I recommend buying a copy before undertaking such a trip - they even have an electronic version if you find a paper document “too 20th Century”.
The Alaska Highway has three road numbers along its length so a GPS is scarcely needed (for most of the trip there was only one road displayed) though it was useful in Canada as my California car did not have KPH markings on the speedometer.
In case you are lost the road numbers are:
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