Brother in Downward Spiral

My brither and I have both have addiction problems since we were teens. We had the same friends and drank, did drugs and partied together (He's 2 years younger than me). We also both share our trauma together. We were physically, sexually, and mentally abused (often at the same moment in time) so in many ways we are very connected. I went down a very self destructive path after our mother's death (she was an alcoholic) from about 2010 to 2016 I was a mess. Suicide attemtps, self harm, severe addiction, DUI, and just adding more trauma ontop of what I already felt. Well, I started therapy, got on meds to stabilize my moods, and started group therapy which all really helped. Unfortunately my brother has started his own self destructive path recently and is up to a fifth of vodka or more every day, plus pills if he can find them. He drives to work every day and his job is starting to notice how bad he is. In the past month he has broke his arm, wrecked two cars, and collapsed at work and had to be escorted off the job for being intoxicated. I am trying to help him any way I can, but my first priority is to get him off the road. How do I do this? Who should I call? This whole situation is just wearing on me physically, mentally, and emotionally. My husband and I are trying to rally friends together to help him. My father is almost no help, so I really have very little family members to turn to. I just need help.