classic33
Leg End Member
The work is being done in an open environment, with the problem being the dust created by the cutting operation. The one driving the combine will be in an air conditioned cab, usually with filters in place. The drivers doing the drawing might not have the luxury of filters fitted to the cab.Hmm, farmers lung's not a lot of fun, but that's by the by to the main point, which is other industries would not be allowed to create a nuisance in that way.
In either of the above, you'll still get a certain amount of dust.
But if it were any other industry, the two in the car would be done for entering onto private property. Property where work is ongoing, and which might end in them getting hurt. The driver on the draw is watching the combine on the other side, keeping a set distance from it. The only other traffic should be coming in from behind, but only when they have moved clear.