UPS trucks don’t turn left. Their policy to never turn across oncoming traffic, even when it shortens their routes, reduces traffic collisions and delays, so they plan routes that avoid left turns whenever possible. This reportedly cuts their number of trucks by 1,100, saves 10 million gallons of fuel and emits 22,000 fewer tons of carbon dioxide per year, and lowers the annual distance traveled by 28.5 million miles. Source Source 2 Source 3