There are five categories of incursion, with the top one being where a collision occurs:
* https://en.wikipedia.org/wiki/Runway_incursion#Definition
* https://www.faa.gov/airports/runway_safety/resources/runway_...
All incursions (in the US) are tracked:
* https://www.faa.gov/airports/runway_safety/statistics
Given there are ~45,000 flights per days in the US (and so aircraft and vehicles would move hither and fro around an airport for each flight), 1700 feels like a small number.
Exactly - it's a small number and should be investigated, because if we reduce the number of all incursions, we reduce the number of collisions (and fatalities).