2024 49 CFR 571.216a – Standard No. 216a; Roof crush resistance; Upgraded standard

2023 49 CFR 571.216a – Standard No. 216a; Roof crush resistance; Upgraded standard

2022 49 CFR 571.216a – Standard No. 216a; Roof crush resistance; Upgraded standard

2021 49 CFR 571.216a – Standard No. 216a; Roof crush resistance; Upgraded standard

2020 49 CFR 571.216a – Standard No. 216a; Roof crush resistance; Upgraded standard

2019 49 CFR 571.216a – Standard No. 216a; Roof crush resistance; Upgraded standard

2016 49 CFR 571.216a – Standard No. 216a; Roof crush resistance; Upgraded standard

2015 49 CFR 571.216a – Standard No. 216a; Roof crush resistance; Upgraded standard

2014 49 CFR 571.216a – Standard No. 216a; Roof crush resistance; Upgraded standard

2010 49 CFR 571.216a – Standard No. 216a; Roof crush resistance; Upgraded standard