The story goes like this:

My friend was driving along Nlex, when one of his tires ran out of air, apparently because of a puncture. Not long after, Nlex Highway Patrol Group arrived to assist. The HPG then told my friend to place EWD (early warning device), which, he did not have. The HPG almost gave him a ticket, but I guess with a little luck, they let my friend off, and just helped him instead.

Now my questions are:

1. Is there really a law that requires motorists to have EWDs in their cars?
2. I'm not too sure about this, but why does it not come as part of stock tools in our cars?
3. Has anyone encountered a similar situation, and if yes, what did you do afterwards?