well each state has their own laws. and each person has their own idea what it is. large # of rules posted by bluebird do not apply in Alaska.
i don't see it as unethical and not illegal. in Alaska as long as you do not shoot from , on or across a road.
Haul road hunting for Caribou is road hunting for the most part you can drive 100 miles and not see a caribou. very few people will park their truck and not use it for the week that they are there. I do for the most part but I "road" hunt from my jet boat all the time. either drive until we see a 'bou or stop every few miles and look with binoculars, if we see one 1-2 miles away we get back in the boat and close the distance. if that is unethicial in your book well paint me that color. In Alaska alot of hunting is done from atv or boats when you spot the game you make the stalk. even from airplanes....but for most animals you can not fly and shoot the same day. ok for deer and some areas for caribou.
large expanses of land in the west make things alot different than hunting 40 acre lots in the east. with very different game densities and habits.