What "circus" are you referring to?
It's unclear about what exactly it is you would like them to stop doing.
Are they:
- Joyriding on the easement?
- Mowing and maintaining the easement?
- Going to the mailbox and back on a tractor?
In general, ingress and egress mean to come and go; on a driveway such as yours this typically covers motorized vehicles as well as pedestrian access.
If your neighbors are destroying the drive with their equipment, you might be able to argue that they are overburdening the easement, and should only use vehicles (automobiles) that would typically be used on a drive like that one. A local Wisconsin Real Estate Attorney can best answer the question of overburdening the easement.
Have you been repairing the road? State laws vary, but in general if there is no maintenance agreement then the responsibility for that maintenance can possibly fall on the shoulders of whoever performs the maintenance. So if it were me, I'd attempt to get my neighbors to sign a maintenance agreement. Again, consult a local Attorney on this one.
I once had a client who was in a similar situation. They could not get the neighbor to agree to maintenance, and the condition of the drive got worse and worse. It sounds ridiculous, but he decided to wash his hands of the whole situation and build himself a brand new drive. He stopped using the easement, and couldn't be happier now. Obviously this is an extreme solution, and one would need to have the resources to build a brand new 200' road, not an insubstantial cost.

