[quote="Canadian_Mind]
And what good is a road that doesn't run int he summer too?
Can't build a highway on pilings so as to avoid frost heave?[/quote]
A winter road and build the all weather as you go as it take's a long time,no such thing as frost heave when dealing with permafrost bud.
I helped build Nunavut's longest road so I know what I'm talking about.
A year to do 100 klik's.
Nothing move's fast in the Arctic.

[/quote]
Frost doesn't melt in the upper few feet during the summertime? I thought it was that melting and refreezing that caused frost heave in the arctic areas.
And Dayum. How much did that cost you guys, and how many people did it take to make that 100 per year?[/quote]
There was 3 camps with about 150 men in each,a rock quarry every ten miles,survival shacks every 5 miles,and it was supposed to be finished in September but wasnt untill the next year so it was very expensive.Because we were counting on it being done we allmost ran out of fuel and had local innuit on snowmobiles bringing in two 45 gallon drum's at a time to fill million gallon tanks

.
There was a whole barge full of brand new equipment that never made it to camp that winter because the road wasnt done,lots of it got trashed in town and a few new machines burnt to the ground.
You can build a road allmost anywhere but as it's so expensive to maintain thats why most supplies are hauled in on an ice road in winter.
I could spend a week cleaning ten miles of road after a storm and if the wind came up that weeks worth of work was gone within minutes and you had to start all over again.
The top layer of frost sometimes melts,depends on what kind of grass is on it,once covered in rock it never melts.
There are geological features though that are due to freeze thaw but its complicated to explain.