> There's 1700+ runway incursions a year in the US alone, each one should be investigated as if an accident occurred and fixes proposed. Like when an accident occurs.
How many runways crossings are there in a year? How much is "1700+" a percentage of that total?
The point is that it doesn't matter what percentage of the total they are, it's that 1 is too high without adequate explanation (the Gimli Glider caused vehicles to be guilty of a runway incursion by turning an abandoned runway into an active one, for example).
And the cost of investigating 1,700 should be within the budget.
My very fuzzy back of the envelope says easily 10s of thousands per day.
A "runway incursion" is a very broad term that includes everything from this accident to a single engine Cessna moving past the hold short line prematurely at a quiet airport.
FAA defines it as "Any occurrence at an aerodrome involving the incorrect presence of an aircraft, vehicle or person on the protected area of a surface designated for the landing and take off of aircraft." [0]
Many runway incursions run no risk of any accident, but are still flagged as issues, investigated, and punished if appropriate.
[0] https://www.faa.gov/airports/runway_safety/resources/runway_...