[powderjunkie]

Any slap it on new cars solution is impractical because it would take decades to become effective.

Just enforce traffic laws and stop overbuilding roads.

The problem with increased enforcement is that it would pay for itself at first...but then people would change their behaviour enough that revenue would not cover the costs. And that people are ####ing stupid and can't fathom the notion that a 12km vehicle trip could take 18 minutes instead of 17 minutes.