The primary contributor of skin color is the pigment known as melanin. The quantity of melanin in the skin varies based on genetic factors and is also dependent on the degree of sun exposure. Melanin is produced by specialized pigment cells known as melanocytes.
Average new tires used on cars typically start with 10/32 to 11/32 of original tread depth. Tires are considered worn out. In most States when they reach 2/32 of remaining tread depth. Ans 2 - Here in Canada (and I'm sure in many parts of the US ) we get a lot of rain.
Directional (unidirectional) Directional tire tread features a large V-shaped pattern with large spaces or grooves between the tread blocks. The grooves improve hydroplaning resistance at high speeds by siphoning water more efficiently through the tread making these tires ideal for performance and ultra-high performance applications.