No, the protest was not on a four lane paved road.
Read it again:
The road was an intersection off of a 4 lane road with a 65 mph speed limit and the blockade was about 40-50 yards from the intersection. The road appeared to continue for approximately 1/4 mile. There is nothing at this intersection that marks it any differently than any other road intersecting this 4 lane roadway.
If this person is a writer, then this passage is something less than a model of clarity, but I don't see how you get that the blockade was on a four lane road. You actually believe that the protest involved blocking a road "with a 65 mph speed limit"? That would be kinda boneheaded.
Either way he should not have been arrested, because remember Freedom of The Press?Freedom of the Press is the right to print, publish, broadcast, etc. without government interference. It does not confer the right to enter or perform acts on private property without consent of the owner, no.
If the protest was on private property - and again, the article is not at all clear about that - then, yes, the videotape would be evidence and can be lawfully held as such.
But you seem to be mis-reading the article if you come away with the conclusion that the blockade was on a four lane paved road with a 65 mph speed limit. It seems to be written to convey that impression, by the use of the phrase "The road was an intersection..." No, a road is not an "intersection". A road is a road. The location appears to be "40-50 yards" on some other "road". Yes, pretty much every private driveway intersects with a public road somewhere, otherwise it would be a pretty useless driveway.
So, was he on private property or not?
(On edit: Yep, it was a driveway -
http://www.coal-is-dirty.com/intergenerational-blockade-masseys-office-boone-co-wv "Four people, ages 22 to 81, block driveway to Coal Company's Regional Headquarters" )