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> Yes I understand airports are complex. So you have a computer and a human, and they work together.

how do you think it works today? some guy with binoculars?

One of the issues being explored is that although US radar is aged, surface vehicles can be equipped with ASDE-X transponders to be more visible to ATC systems. https://www.faa.gov/air_traffic/technology/asde-x

The vehicle that crashed into the plane did not have one and thus no automated alert was triggered.

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