Motorist , you have been yellow carded

Interesting idea for motorists that take cyclists /pedestrians for granted . The idea is that you throw this Yellow card on cars that play foul . As the author puts it

Subversive intervention via businesscard-sized magnets,

.
The text from the yellow card :

Magnetic Yellow Card

"This magnet was tossed onto your car by a cyclist who felt that you might have been driving in a way that could have endangered their life.
They chose to toss this magnetic note because it can neither damage your automobile, nor affix itself to rubber or glass and will therefore not affect your driving. It serves to warn you.

With thoughtful contemplation and reverence for humanity, we can adjust our behavior to allow for all people to live life.

This is a yellow card, let’s please not let things get to Red."