It's an official petition through the Australian Government's e-petition page, which means if it gets enough signatures, it will be tabled in government.
You do have to be an Australian citizen to sign it, BUT!!! PLEASE REBLOG THIS EVEN IF YOURE NOT, because these kind of things have a roll-on effect, and if Australia legislates LED headlights, then other countries may follow.
FYI, the petition asks only for your name and email, and once you've clicked the sign button, they'll send you an email to confirm your signature --- you need to click the confirmation link in the email to have your signature counted.