{"operation":"document","citation":"49 CFR 172.503","title":"Identification number display on placards.","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"For procedures and limitations pertaining to the display of identification numbers on placards, see § 172.334.\n\n[Amdt. 172-58, 45 FR 34701, May 22, 1980]","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-172-503.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-172-503.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-172-503","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-172.503","body":"For procedures and limitations pertaining to the display of identification numbers on placards, see § 172.334.\n\n[Amdt. 172-58, 45 FR 34701, May 22, 1980]","truncated":false,"body_characters":153}