In high-density Very Narrow Aisle (VNA) warehouses, the turret trucks have historically been guided by a physical copper wire buried in the concrete floor. An electromagnetic field generated by the wire keeps the truck perfectly centered in the aisle. If that wire gets cut during a floor repair or concrete settling, the truck immediately stops, and finding the break requires ripping up the warehouse floor.
The industry is now in the middle of a mass transition away from buried wire to magnetic tape guidance. Instead of cutting a trench, maintenance crews simply peel and stick a highly magnetized rubber tape directly to the surface of the concrete aisle. The forklift uses a sensor array mounted just above the floor to read the magnetic signature of the tape and keep the truck centered.
The operational difference is staggering for facility managers. If a forklift accidentally scrapes the tape and damages it, a warehouse worker doesn't need an electrician or a concrete saw. They just cut a two-foot section of the old tape, peel it up, and stick a new piece down. The truck calibrates to the new seam automatically. The only drawback is durability; surface tape is vulnerable to heavy steel debris scratching it or forklift tires grinding it down over a few years. But the ability to completely re-route an aisle in a few hours by peeling up the tape and sticking it down in a new location-without destroying a million-dollar concrete floor-is forcing the older wire-guided systems into obsolescence.
