Why do heavy motor trucks have deep tread patterns on their tires?

Why do heavy motor trucks have deep tread patterns on their tires?
  1. To reduce friction so they consume less fuel
  2. To increase friction with the road for better grip and control
  3. To collect mud and soft soil while driving
  4. To generate static electricity to power headlights

Solution

Treads increase surface roughness, providing higher friction and preventing tires from slipping on wet or loose roads.

Asked in: Homi Bhabha Practice

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