Which condition represents a violation of traffic rules regarding a solid white centerline?

A solid white centerline is used to indicate that lane changes are discouraged or prohibited. This line typically signifies that crossing it can be unsafe or unlawful, as it separates traffic moving in opposite directions or keeps drivers in their designated lanes.

Touching the solid white centerline with vehicle wheels represents a violation of the traffic rules because it indicates that the driver is encroaching onto the lane that is intended for opposite-direction traffic or is driving too close to the line meant to keep lanes distinct. This can lead to dangerous situations and is not compliant with safe driving practices.

Other conditions, such as crossing the line only when the road is clear or positioning a vehicle parallel to it, may not be violations if done with caution and awareness. Not paying attention to the line also includes a failure to adhere to the established traffic rules. However, physically touching the line with the wheels signifies a tangible infraction.