Most new model cars now come equipped with not only driver - side airbags but also passenger - side, and / or side curtain airbags. (comedydefensivedriving.com)
Most of the stuck cars had only a driver in them. (honeyandbirch.com)
But with only the driver (or instructional designer) in control, the bus still gets to its destination, but the trip is less beneficial to each individual passenger. (talentlms.com)