"Major distraction" refers to something that pulls your attention away from what you are supposed to focus on, making it difficult to concentrate or work effectively. Full definition
However, social media has also been a source of major distractions for those behind the steering wheel of a car. (autonationdrive.com)
Make sure there is no other major distraction at the time, such as the birth of a sibling / change of home or nursery / going on holiday. (momtricks.com)
New car systems allow sending or receiving electronic messages using hands - free devices, but they are still major distractions to driving. (scientificamerican.com)