designated driver
noun
: a person chosen to abstain from intoxicants (such as alcohol) so as to transport others safely who are not abstaining
had some nonalcoholic champagne on hand for the designated drivers
Example Sentences
Recent Examples on the Web General admission, $50 plus fees; VIP, $80 plus fees; designated driver and shuttle tickets, $15 plus fees. 
Gege Reed, The Courier-Journal, 2 Mar. 2022 Prices are $20 for military and designated driver or $30 for general admission; commemorative glass included. Laura Groch, San Diego Union-Tribune, 5 Dec. 2021 Tickets are $50 in advance and $55 at the door; designated driver tickets are $20. Annie Alleman, chicagotribune.com, 3 Sep. 2020
Gege Reed, The Courier-Journal, 2 Mar. 2022 Prices are $20 for military and designated driver or $30 for general admission; commemorative glass included. Laura Groch, San Diego Union-Tribune, 5 Dec. 2021 Tickets are $50 in advance and $55 at the door; designated driver tickets are $20. Annie Alleman, chicagotribune.com, 3 Sep. 2020 Word History
First Known Use
1982, in the meaning defined above