Wheel alignment and stability: Toe-in is set on a vehicle's front axle. What is the principal benefit of toe-in as stated here?

Introduction / Context:
Toe-in and toe-out are alignment settings affecting tire wear, steering stability, and straight-line tracking. Manufacturers specify a slight toe-in on many vehicles to compensate for compliance and dynamic forces.

Given Data / Assumptions:

• Statement: Toe-in ensures parallel rolling, stabilizes steering, and helps prevent side slip and excessive tire wear.
• Normal road speeds and typical front suspension compliance.

Concept / Approach:
Under forward motion, wheel bearing and bushing clearances plus lateral forces tend to spread the front wheels, reducing static toe-in to near-zero. Starting slightly toe-in thus yields near-parallel rolling during driving, enhancing straight-line stability and wear.

Step-by-Step Solution:

Verification / Alternative check:
Alignment specs in service manuals include small positive toe values; test drives confirm reduced wander and uniform tread wear with correct toe settings.

Why Other Options Are Wrong:
Marking the statement “Incorrect” would contradict established alignment practice for many road vehicles where slight toe-in is recommended.

Common Pitfalls:

• Confusing toe with camber or caster; each affects handling differently.
• Setting toe-in too large causes rapid tire feathering and drag.

Final Answer:
Correct