Have you given any thought to putting your grief into action by joining a local group that advocates against drunk driving?
Here's one to check out. Mothers Against Drunk Drivers has local chapters in many states.
http://www.madd.org/home.aspx
They also have victim services that would be help you with coping with the sudden, unexpected death of your father. They include moderated online chat groups and other grieving and emotional support. Maybe you and your mother can look into this together.
http://www.madd.org/Victim-Services.aspx
Another thing they do is have speakers come to schools to talk about drinking and driving. It might help both you and the rest of your peers learn more about the risks and how they can help stop it.
My dad passed away from old age and an illness a couple years ago and I still miss him a great deal. Many of us here have lost a parent or two and know what you are going through. You aren't alone in that and it will take some time for it to not hurt as much. It is good that you are reaching out to people on the internet and asking for help with it. Please also do this offline. Those physical, comforting hugs from a loved one or friend really do help mend a lot of the pain.