Several decades ago, my friend and I bought a pair old Farmall Hs about 40 miles from home. My Dad drove us over to pick them up, and we started on the lengthy drive home. I used the old trick of pushing in the clutch to freewheel down hills to pick up speed. My dad was ahead of us in a truck, and on one particularly nice hill, I was picking up speed nicely. The problem is that it was a verrry long hill and quite steep, with deep ditches on the sides.
I knew I was approaching too fast a speed, so I gently let out the clutch. The engine hit RPMs akin to a NASCAR race car, so the clutch went back in and the speed continued to increase. I knew steering brakes are seldom balanced, so I lightly touched them, and the tractor careened sharply Right, so scratch Plan B. The steering gear was typically worn, so I was steering like crazy just to keep the thing straight.
Just when I thought things couldn't get worse, I realized I was rapidly approaching the back pf my Dad's truck. He was a farmer, so seldom drove over 45mph and seldom checked his rear view mirror. Mercifully, This time he did check the mirror and hit the gas. Halfway up the next hill we all stopped, and he gave my friend and I a lecture (something he rarely did) about how unsafe that was. I think he was unnerved by what could have happened. Near as I can tell, I was doing 45mph on a Farmall H tricycle with worn steering.
I learned my lesson that day.