NYC Hosts the World's Busiest Trader Joe's on the Upper West Side

• NYC's Upper West Side hosts the world's busiest Trader Joe's.
• The store spans three levels with four escalators and two elevators.
• Opened in 2006, it requires triple the usual staff for crowd control.
• High customer traffic often causes lines to stretch onto the street.
• Customers struggle with cell reception issues underground.
• The store's layout is described as a 'bizarre', maze-like flow.
• Trader Joe's now has over 600 stores nationwide, starting from California.