Clogging the Intersections

Why does it seem that the most common traffic problem I encounter the clogged out intersections?  We have those yellow signs on the intersections that says "no blocking" the all important crossings everywhere.  And if we've learned to drive properly, I mean not just skills but also driving etiquette, we shouldn't even need those on the roads.

I would think MMDA/traffic enforcers can reach their much maligned quotas better by just enforcing the no-blocking-the-intersection rule.  If there's such a rule, that is.  If there's none, than they should introduce it as fast as they can.  If they do just that, maybe traffic in the Philippines will be much better.

Now what do I mean exactly by this rule?  Well, we know the green light means go.  What the rule would do is that if you see a green light but you're not sure if you do proceed that you'll be blocking the intersection, then you'll just simply have to wait and see.  We need to exercise our brains more while driving anyway. 

Why do we need this rule?  The time you saved by blocking the intersection but getting an early pass is amplified into time waiting for a lot more cars.  Driving is a social exercise.  Treat each egregious apathy to other drivers as a personal insult.