New Hampshire Commercial Driver's License (CDL) Practice Test

Using tire chains is a common practice for enhancing traction during winter driving conditions. The recommendation to use chains only on the drive wheels is important for several reasons.

When tire chains are installed on the drive wheels, they help improve traction and stability, especially on slippery surfaces covered in snow or ice. This is critical because the drive wheels are responsible for the vehicle's acceleration and control. By equipping just the drive wheels with chains, the driver can maintain effective handling and avoid detrimental effects on steering control and vehicle dynamics.

Installing chains on all four wheels may seem like it would provide a better grip, but it can lead to issues such as overstressing the vehicle’s suspension and drivetrain. Additionally, it might make steering difficult and lead to uneven wear on the chains due to the varying nature of the surfaces covered by each set of tires. Furthermore, using chains on non-drive wheels can be less effective since these wheels do not contribute to the vehicle's power distribution.

Thus, using chains exclusively on the drive wheels balances traction benefits while maintaining vehicle control, making it the recommended practice in winter weather conditions.