The roads up north are generally pretty good. Some construction here and there but just take it slow and things there are fine. If they're driving down from Haines Junction, YT, they can expect few, if any, services on that road. In addition, the customs/border crossing is NOT open 24 hours, so they need to time their run to hit it when it's open. As others have said, make sure they check the weather closely and often. Things up there change very quickly and you can't expect an open motel or restaurant just down the road, so plan ahead, plan ahead, plan ahead. BTW, the Alaska Highway was closed near Haines Junction for snow around August 20th this year, and when we went through a week later there was NO SNOW to be see except on the peaks.