OSHA 10/30-Hour Training
OSHA's Outreach Training Program, delivering a 10-hour safety awareness course for entry-level construction workers or a 30-hour course for supervisors, through authorized trainers. The program itself is voluntary at the federal level, but many states, municipalities, and general contractors' own site-access policies require the card in practice.
Why it matters
Because the card isn't universally mandated by federal law, whether it's actually required depends entirely on the state, the municipality, and the specific general contractor's own site-access rules, which is exactly why a worker can't assume it's optional just because federal OSHA itself doesn't require it everywhere.
On a real project
A new construction laborer completes a 10-hour OSHA outreach course before their first day on a jobsite, not because federal law required it everywhere, but because the general contractor's own site-access policy requires the card of every worker regardless of what state law does or doesn't mandate.
Who this matters most to
A Safety Manager tracks which workers hold current OSHA 10 or 30 cards and enforces whatever combination of state law and company site-access policy applies to a given jobsite.
Where this goes wrong
A new hire shows up to a jobsite without an OSHA 10 card, assuming it wasn't legally required, without realizing the general contractor's own site-access policy requires it regardless of state law. They're turned away at the gate on their first day.