Because they are so fluid, they occur at different speeds, times of day and in different terrain with different traffic conditions. The perpetrator can be in any make or model of car, so it’s hard to make devices that will disable or attach to any moving car. Spike strips are effective because basically all road vehicles, barring a couple of construction vehicles, run on air filled rubber tyres.
EMPs are apparently not as effective at disabling cars as the movies suggest by the way:
https://www.superprepper.com/will-cars-still-run-after-an-emp/
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