Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Ensures that effective braking can be performed, even on slippery surfaces
Eliminates the need of snow tyres, tyre chains, etc.
Delivers improved cornering on dry road surfaces

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Automobile Engineering in ME
In radial tyres

None of these
One ply layer runs diagonally one way and another layer runs diagonally the other way
All plies run parallel to one another and vertical to tyre bead
Inner tubes are always used

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