Wear indicators Tires , Rotors, Brake Pads

Currently allot of the wear indicators are done on tires with coins and tools etc. I foresee all wear indicators are color oriented and located in the tires would be a color bar system wear a different color would appear based on the tires health. A green- yellow- red rubber can be molded in the tire and appear as the tires wear showing the owner exactly what the health of the tire is. Furthermore this would be placed across the entire surface to show the viewer if the tire is wearing abnormally from across the tread inside to outside. Same principally can be applied to the rotor. For the brake pads a releasable dust that would visually let the owner know they are near there end.