How does the packing group affect the limited quantity threshold?

ADR Table A sets limited quantity thresholds per UN number and per packing group. PG III substances typically qualify for the largest LQ inner and outer packaging allowances — higher volumes per package before full ADR transport document, vehicle marking, and driver certificate requirements apply. Some PG I entries carry no LQ allowance at all, meaning the full ADR compliance chain applies regardless of package size or total consignment weight. The packing group is a direct control point determining whether a consignment qualifies for simplified LQ rules or requires full ADR treatment at every step of the transport chain.