Probably one of these: Cargo Secure Load Securement & Impact on CSA Scores Dont wanna spend $35 on the spiral binder? use this OOS PDF : Heres my personal copy of the 2019 updated PDF North American Standard Out-Of-Service Criteria.pdf
Just remember when you see crap on the shoulders or in the lanes that someone thought it was good enough without making sure it's secure. My opinion is that if it will come off if I roll it, then iit needs another strap. Can not be to secure. You got a good cop you were lucky