A backseat driver is a passenger in a vehicle who is not controlling the vehicle but who excessively comments on the driver's actions and decisions in an attempt to control the vehicle. A backseat driver may be uncomfortable with the skills of the driver, feel out of control since they are not driving the vehicle, or want to tutor the driver while they are at the wheel. Many comment on the speed of the vehicle, or give alternative directions.
Some backseat drivers exhibit this type of behavior simply because they feel the driver is taking risks they would not normally take, while others may have other reasons to be nervous, such as when the driver has a poor driving record. However, the practice is somewhat dangerous and instead more likely to cause crashes, according to the Daily Mail, citing a 'Driver Distraction' study by Esure.
The term is also used allusively for any person who intervenes with advice and instructions in affairs they are not responsible for, or subjects they may not understand well. This is in a manner similar to "armchair professional" terms like armchair general. For example, Barb Palser in the American Journalism Review article comments that "The ascendant blogosphere has rattled the news media with its tough critiques and nonstop scrutiny of their reporting." Similarly, it has been used to describe interference from people in business, such as excessive micromanagement.
The term has been used for technology, such as devices installed in a car which observe the driving through electronic means, and inform the driver or a third party.
The Maine Department of Transportation has a web poster "Are you a Good Back Seat Driver?" asking "True or False: Being a Backseat Driver means it is okay to be noisy or distracting to the driver as long as you are giving them safety tips." The Inland Register produced by the Roman Catholic Diocese of Spokane makes use of it in a sermon: "Even our phrase 'back-seat driver' reflects this new-found freedom. Which of us who has graduated to the status of driver enjoys a passenger, especially one out of reach in the back seat, who seems to know how to drive better than we do?"
The Art of being a Backseat Driver in the San Bernardino County Sun summarizes various comments of the sort otherwise found in multiple blogs. Some are specialized, such as the Back Seat Driving blog, formerly the "LA Car Blog".
A famous example of a back seat driver is Hyacinth Bucket on the British sitcom Keeping Up Appearances. The term is also used in Backseat Drivers from Beyond the Stars, an episode of Invader Zim. A poem "The Backseat Driver" by Parick G Hughes appears in the Northern Ireland BBC.