My grandpa had a lot of rules. No water parks. No fireworks. I was also to avoid left turns if possible, opting for several right turns rather than a single left. At least for the last piece of wisdom, grandpa was right. UPS has on-board computers to minimize the left turns made by their drivers. Many of the 10 million motor accidents reported yearly on roads in the United States involve left turns.
A fascinating story I heard on NPR today said that many engineers advocate "diverging diamond" intersections to solve the left turn conundrum.
"Hate Left Turns? Take a 'Diverging' Route" on NPR