Abstract: A barrier apparatus for protecting a bus driver including a vertically-oriented panel selectively moveable along a set of tracks between a forward position and a rearward position within a bus, the forward position including the panel positioned between a driver's seat and a passenger entryway of the bus. The panel is arranged so that, when in the forward position or the rearward position or moved between the forward position and the rearward position, the panel remains on a driver's side of the bus thus ensuring that the panel does not obstruct passenger traffic into and out of the bus during any phase of operation of the barrier system.