what sort of malicious anarchist tosses thousands of nails on an interstate? State Route 16 in Tacoma

https://komonews.com/news/local/nails-scattered-on-sr-16-cause-traffic-chaos-pedestrian-in-custody-commute-road-highway-danger-alert-seattle-travel-weekend-wsdot

Update, Sept 9 2025, someone placed a crate of screws on Interstate 5 in Eugene Oregon

https://katu.com/news/local/crate-of-screws-in-roadway-causes-crash-on-i-5