[GaryVoshol]

http://forums.usfirst.org/showthread.php?t=8595

The cables for the lap counters are attached to the Overpass, above The Track. The support plates for the Lane Divider are placed on top of the carpet, and covered with a second piece of carpet that is taped in place. Under the main carpet of The Track you would find (depending upon the venue):
- Wood planking or concrete floor or iso-grid plastic matting , then
- Plywood subfloor or ice (optional), then
- Floor joists or reinforced concrete, then
- A crawlspace (optional), then
- Packed soil, then
- Clay, then
- Bedrock, then
- Continental crust, then
- The Moho Discontinuity, then
- Upper Mantle (primarily composed of molten peridotite, eclogite, olivine, spinel, garnet, pyroxene, perovskite, and other oxides), then
- Lower Mantle (primarily composed of magnesium and silicon oxides), then
- Core (primarily composed of iron and oxygen, sulfur, and nickel alloys)