A mobility securement system, and method for securing a wheelchair or other mobility device, and its passenger, within a public or private vehicle. In various embodiments, the system includes one or two attachment members, one or two vehicle anchor assemblies and, potentially, at least one fixed or moveable bumper, and may further include a barrier. A tensioning assembly is operably connected to at least one attachment member and vehicle anchor assembly. One or more moveable bumpers may articulate to apply a force against the mobility device, and one attachment member may be hidden behind a stored position of a moveable bumper.