Thanks for Your replies!
Ok, I found it on my hard drive:
Its on "Alaska Wing Men", Episode "Explosive Cargo", Minute 42:30 to 45:42.
Student pilot and instructor training emergency landing on a road full of traffic. They land on the road and take-off later.
The narrator says:"In Alaska its perfectly legal for bush pilots to land on a road full of traffic."
Looks like some advanced training here for a young wannabe bush pilot.
Your freedom of flying there is absolutely amazing and fascinating because in my country everything is "verboten" and anything "off-airport" is a strict no-no...