Designating a driver is a very popular tactic to avoid drinking and driving.  It is important to plan in advance, because your brain function will slow down and your decision making skills will be impaired once you start drinking. Decide before you begin drinking that you will not drive.  Figure out who will be getting you home before you leave. Make sure this person is responsible and keep them in your sight while you are drinking.  Have their contact information handy in case you can’t find them when you are ready to leave.  Choose a friend who doesn’t drink alcohol.  You likely have someone in your friend group who doesn’t drink.  This person is the most likely to remain sober. Decide on one person who will remain sober.  You can take turns within your friend group, alternating who will be the designated driver on each occasion.  Be sure that the designated driver actually remains sober.  The person who has drank the least is still not sober. If you don’t have your car with you, you can guarantee that you won’t make the choice to drive it home. If you are drinking at your home.  Give your keys to a responsible friend to ensure that you don't choose to drive somewhere after you have been drinking. It may be tempting to stay longer or leave with someone else.  Stick to the plan you made in advance and only leave with your sober, designated driver.  Keep the phone number of your driver handy in case you can't find them when you are ready to leave. If your designated driver drinks alcohol, find alternate transportation to get home.
Plan in advance. Assign a designated driver. Leave your car at home. Leave the venue with your designated driver.