Toll roads are there to keep ppl off the road because that road cannot handle any more traffic, it is not meant for financial gain or alternatives to build wide roads, and this is why we have toll roads. Every one complained about server queue times and numbers allowed into WvW. So much so Anet bowed to the demands. We need leaders who are educated and find good solutions.
So the only option I see at this time is to split the zerg if Anet are reluctant to do so.
1. Hit as many targets as we can and spawn so that big zerg have to split up, then we unit and hit the smaller groups, hard work but will kitten them right off.
2. Run straight for a zerg ( if we can see them ) and split up into a Y formation and regroup behind them. ( 2 commander tags )
I will say it again. A very big zerg should not be allowed, they need to implement some kind of handicap. e.g. big heavy zerg move slower and slower the more they have and small groups have swiftness. Move a big army into a battle zone of fly in a small reconnaissance mission. A group of 5 have a horse with them, group of ten have a camel and a group of 20 have an elephant(s).
Now we know roads don`t get build overnight and cost lots of money. When last did anyone spend any money with Anet, free to play?