We should have volunteer patrols armed with bows and arrows stationed around. Maybe they get paid 25r/hr to watch certain parts of the bridge. Like highway patrol. and then if they spot griefers they'll shoot them and the griefers will shoot back and then the cops will have to call reinforcements and then the swat team comes on a chopper and shoot the griefers dead with a sniper rifle and then something will explode in slow motion and then the Police chief will come and reprimand the patrol but in the end he will say good job and we wait for the sequel movie in 2-3 years.
I love your sense of imagination Also, what's the fun in walking along a road when you could be adventurous!
World edit would generate blocks. Griefers would destroy blocks. Griefers would technically gain hacked blocks. I don't like the idea but we can't say it's impossible. Yes, Justin would have to make every road a res (like spawns/outposts) but it could be done. However, the cons outweigh the pros. Yes, you could travel easily but so could griefers. And we wouldn't want to help a griefer.