Not sure how effective it is but if you roam the junkyard you can find more barricades, theres also the one in the underground when you explore. Hope this helps :)
Roam where, exactly? I found one barricade by rummaging through the eastern junk pile, and then a second in the underground by clearing the path for the first time, but I can't find any more.
I could be wrong but I believe if you check all the junk piles in the junk yard you could find more. Not sure how many there are in total or if it's worth it tho since the junkyard is still being devloped story wise.
