How to avoid impaired driving?

Don't drink alcohol or use drugs.
Use the convenient (crowd-sourced) taxi services such as Uber or Lyft (if it is available in your area).
Use a regular taxi or public transportation.
Assign the role of 'designated driver' to a friend.
If you are impaired, stay where you are until you are sober.
If you believe friends may be impaired, encourage them to stay the night.
Stay home and drink responsibly.
Allow someone who is not impaired to drive your car for you.

Designated Drivers
Designated drivers can save lives. The Designated Driver Program is a program that aims to cut down on DUI and keep everyone on the road safe.
A designated driver chooses to abstain from drinking during an outing so that he or she can later be responsible for driving friends home safely.

Many eating and drinking establishments participate in the program, and will provide complimentary non-alcoholic drinks to designated drivers for the night.

To be a designated driver, the person must:

Have a valid driver's license
Be at least 21 years old
Be a part of a group of two or more people
Identify himself or herself verbally as the designated driver for the group
Not drink any alcoholic beverages before or during the outing
Not be impaired in any other way

Having someone serve as the designated driver is always a good idea. If you do not have a designated driver, there are other options: take Uber, Lyft, a taxi or public transportation, call a sober friend for a ride, or stay where you are for the night.

No matter what the circumstances, never drive if you are impaired by drugs or alcohol.