If you note standard lighting practices, red is never in front, and yellow is very often on sides with red always at the rear.
That being noted, it would seem that yellow would be an appropriate tape on sides.
I seem to recall yellow and black stripes used on sides of some equipment.
My tractor looks like a Xmas tree under the glare of high beams.
Loader arms have the super white on sides, bucket the yellow/black on sides and my snowblower bank cutter bars are red/white.
Back of my tractor sports strips of red 3M DOT tape as well as the triangle SMV!
I also have a yellow strobe on the roof.
As you can gather I have had a few close calls cleaning my driveway.
Just too many idiots out there.
I'd be backing out blowing snow, and idiots would step on the gas to pass before I completely closed the gap.
In other words a race for a 4-5 ft space. (in a snow storm yet)
To make matters worse, there are a mere 10 people that live past me on a dead end country hilly twisty road.
Since they always get up too late, they need to step on the gas to make it on time.
Wost yet, they are putting on lipstick, on the cell phone or adjusting a tie.