| there are 2 types of traction, 1 is friction (2 materials simply touching each other much like getting 2 phonebooks and laying every other page on each other, lock them together) 2 is mechanical, like teeth on gears meshing together (think of sweeping with a broom, when parallel with the direction of sweep, there are more bristles able to push against the floor in the direction of sweep, when perpendicular with the direction of sweep the bristles simply wipe across the floor like a squeegee) Here is a crudely drawn illustration of how the rubber acts when directionally contacting the road, there is a mechanical advantage to have the tread in the direction of the force being applied, the rubber seemingly wipes over the pavement when there is nothing keeping it against the tangent of the wheel. 
Traction is too dynamic to say such a linear statement that "wider is better" traction is also directional so the shape of the footprint also plays a part, a wide tire can grip better laterally than a tank track with the same foot print area and pound per square inch, a tank track can grip better than a wide tire in the forward direction for the same reason. It would be wiser to think, "what is the problem I'm having and what can I do to fix it" one size fits all does not apply, you must choose the correct tire size, shape, material for what you are trying to accomplish. Stickier seems to me to be the only thing that you can't get enough of (at the expense of wear life or cost).
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"The dreaded 2nd windshiled wiper swipe when you turn it off its almost like tis showing you that it's boss, and it doesn't have to stop when you tell it to :("-College Boy (discussion on ptu relocation)
"No good reason to put it there anyway. -Bernie (NoVA)
False -vorpalZ
False. -Bernie (NoVA)
You're correct, there are 3 good reasons -vorpalZ
False. -Bernie (NoVA)
Wow, right again, just remembered another, make that 4 -vorpalZ"
XD 
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