UPS trucks don’t turn left. Their policy to never turn across oncoming traffic, even if it’s a shorter route, reduces accidents and traffic delays, so they plan out their routes to avoid left turns when possible. They say this 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