This limitation to drums and jerricans with removable head is not due to safety reasons, but it probably was not realized that there might be a need for such small outer packagings as usually larger amounts of dangerous goods are transported.
Cette restriction n &apos; est pas motivée par des raisons de sécurité, mais parce qu &apos; on ne s &apos; est probablement pas rendu compte que l &apos; on pouvait avoir besoin d &apos; emballages extérieurs aussi petits.