according to tomtoms annual traffic index, istanbul is the most congested. city in the world, followed by mexico city, and rio de janeiro. los angeles ranks tenth on that list. mexico city officials have an unusual idea for one way to deal with their city's terrible congestion rate. their solution isn't to reduce the number of cars on the roads by increasing subways and buses. it's a loftier goal. the next time you're stuck in a traffic jam, imagine how would you feel if you could soar above all of the cars stopped below. well, officials in mexico city are proposing a system of elevated gondolas that would allow their citizens to do just that, ads quartz has reported. take a look at the proposed gondola system. as you can see from the model these fit two passengers. they can change direction on the track. in fact, commuters can save time by stopping only at their destination unlike a subway or