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“Do you mean to say the ‘DD’?” the officer asked, referring to the abbreviation for a designated driver who would remain sober while others imbibed.

Others want to retain the ability to be responsive or responsible for later activities, like serving as a designated driver, operating heavy machinery or being “on-call” for work.

Just remember, if you’re going to smoke up along the way, pick a designated driver.

The experts recommend future research that explores the potential role of L4 AV as a 'designated driver' and its impact on road safety.

With 0.05%, “I think the studies show that people will be better at self-regulating, that they will say, ‘Oh, I need a designated driver,’” she said.