Why UPS Trucks Almost Never Turn Left

One wasted minute/driver/day costs UPS $14.5 million over the course of a year.

The average left turn (in countries driving on the right) takes longer than the average right turn, as one needs to cut across traffic. Longer times means increased fuel usage and increased shipping times, so increased overall costs.

Furthermore, left turns are almost three times more likely to kill a pedestrian.

Thus, UPS drivers try to avoid left turns as much as possible, leading to big gas savings, a reduction in CO2 emissions, and an increase in efficiency.