Traffic volume can be a drama but volume plus control equals crisis.

BBC: Viewpoint: Is it time to get rid of traffic lights?

Air traffic was growing, and the air traffic control (ATC) system couldn't handle the swelling volume.

FORBES: Magazine Article

The administration's funding authorization expires Sept. 30, and it needs more money to address the booming volume of air traffic, primarily because the air traffic control system needs safety and security upgrades.

FORBES: Magazine Article

Among the most dramatic of Bush's proposals is a fee that the Federal Aviation Administration would charge airlines to help pay for new air traffic control services, which are becoming strained by an increasing volume of air traffic.

FORBES: Magazine Article