The road existed after 9 months, but it was unpaved and only open to military convoys, as it often needed repairs and was single track in places. This was fine for its purpose (a land route to get materiel to Alaska in case the Japanese attacked), but isn't what most people think of when they think of a highway.

It's a huge achievement - something like 10,000 soldiers were involved in its construction.

But I worry that when most people think highway they think of the interstate system - straight lines, gentle grades, paved, multiple lanes.

This is more akin to the army setting up camp and building accomodations for thousands - we wouldn't say they built 1000 houses, they put up tents. Still an impressive logistical feat, but... different.