Indoor surfaces are usually concrete or asphalt and tend to be smooth. Forklifts used on indoor surfaces generally have cushioned/solid tires. The smoothness of the surface can sometimes pose a hazard. Operators must pay close attention to the condition of the floor. Traction can easily be lost when the forklift travels over foreign substances such as dust or spilled products. Traveling over severe cracks, holes and/or seams In the floor can cause loads to shift and become unstable. Indoor surfaces should be well maintained and any potential forklift operating hazards should be Immediately cleaned up and/or repaired.