The center portion of a traffic lane is where:

The centermost portion of a lane is where debris and oil drippings from cars often collect. Other hazards, such as utility hole covers, can also be found in the centermost portion of the lane.

• Debris and oil drippings from cars often collect.
• Motorcycle riders should always travel for safety.
• Most accidents happen.
• Drivers are least likely to see a motorcyclist.