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 friction in cars can be reduced with new technologies such as new surface coatings, surface textures, lubricant additives, low-viscosity lubricants, ionic liquids and low-friction tyres inflated to pressures higher than normal.To reduce the friction humans are using machinery lubricants 
In various machine like cars,bike,and buses.

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The techniques used to reduce friction could be, by adding lubricants, polishing surfaces and also by making the surface smooth so that there are lesser irregularities and thus less interlocking between the surfaces.
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