The opening staff statement of the 9/11 Commission’s hearing on May 18, 2004 “…gave an overview of the World Trade Center complex: how the [February 26] 1993 bombing revealed serious shortcomings in preparedness, as it took nearly ten hours to completely evacuate the buildings, and how the Port Authority provided $100 million in upgrades after 1993, including better lighting and glow-in-the dark signs in stairwells, a redesigned command board to monitor all the elevators, and a new ‘repeater system’ that used an antenna on top of the World Trade Center 5 to enable firefighters’ radios to work better in the high-rise towers.”

 – Thomas Kean and Lee Hamilton, Without Precedent, Page 219