People interacting with their phone while driving have been implicated in an enormous number of accidents. The National Highway Traffic Safety Administration says 3,166 people were outright killed as the result of distracted driving in 2017.
Apple added the Do Not Disturb While Driving feature in iOS 11 as a tool to help reduce distractions without you have to take extra steps. It leaves Siri enabled among a few other features. But the DND-While-D feature can trigger automatically when you’re not in the driver’s seat. You might be a passenger in a car or in another mode of transportation.