CNBCLos Angeles backs 'risk taking' of Elon Musk's Boring Company — Residents fear damaged homes, earthquakesCNBCLos Angeles is the world's most gridlocked city — the average LA driver spent 102 hours (or more than four days) stuck in traffic in 2017. David Spiegel | @dwspiegel. Published 8 Hours Ago Updated 8 Hours Ago CNBC.com.