You are moving a wide hydraulic folding machine, such as a tedder or a sprayer, on a public road. Which precaution matters most before setting off?

1. Leave the machine unfolded so that its full width is obvious to other traffic
2. Raise the machine on the three-point linkage to its highest position for ground clearance
3. Fold the machine into its designated transport position and check the resulting transport height against overhead power lines, railway catenaries and bridge clearances
4. Fold only one side, so that the tractor stays balanced