Treadmill roads at lights and highways!
Double deckers seems like a good idea but its unsafe
so lets move on to the next idea that is also popular...
expand the metro rail.. also not a good idea since eventually it would be just as dirty and unsafe which people wont like to take, how us Miami people are of course.
The issue with traffic is that when you're at a light not all cars accelerate at the same time therefore causing backup and affecting the amount of cars to pass. Instead roads should be places on a treadmill system in which lets say the road is 500 ft but the treadmill would move these cars to the next road within 30 seconds of the light being green so all cars in the 250 ft of the road (the section where the treadmill was built) would move these cars forward, left or right. At this point cars would move through quicker