The internal combustion engine still rules America’s roads, and without South Africa’s PGMs, its vehicle industry would find itself floundering and scrambling.…. Enter your email below and we'll send you a one-time pin to log in. {JSON.stringify(article.attachments[0], null, 2)} --> The internal combustion engine still rules America’s roads, and without South Africa’s PGMs, its vehicle industry would find itself floundering and scrambling.