I always enjoy seeing these 30 inch yellow triangle traffic signs all over our roads while geocaching. Deer Crossing. Ped Crossing. Bear Crossing. Elk Crossing. In this case, this is my favorite, Farm Equipment Crossing.
The question for this puzzle is, What is the Ratio to the radii of the two tractor wheels? For example, if the ratio of the big wheel to the small wheel is 3/2 then you enter "1.50" into Certitude. Don't forget. Two sig figs!
You can validate your puzzle solution with certitude.