Physics

Some simple physics one probably already knows, apply it, and save your life

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http://www.canadiantire.ca/AST/ResearchCentre/WinterFunctionalTires.jsp

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There are some very simple formulas we should go over dealing
 with traction and friction.

    The forces acting on a vehicle are gravity, Fg, the normal force, N, and
    the friction force, f.

    There is always a coefficient of friction between the road and the tires.


Ff= f x Fg

(Friction Equation Ff is the friction between the two surfaces)

The traction of any tire can be increased by either increasing the coefficient
of friction, f, or increasing the normal force, Fg.

http://www.worsleyschool.net/science/files/tires/andfriction.html
 

To increase the coefficient of friction you must have the right tool for the job, IE the right tire for the condition. Increasing the normal force is increasing the weight of the vehicle, which is up to the manufacture to properly distribute the weight.