A measurement technique which allows the error components of the testing process to be eliminated by performing a differential-style measurement of the programmable termination resistor network. The vehicle partition includes upper mounting brackets and lower mounting brackets that allow for limited, rearward motion of the vehicle parrition in the event of a rear-end collision to reduce the crash impact forces on front seat occupants. The electrical tilt angles of each antenna stack or are controlled to be equal to those of the other antenna stack to provide co-polarisation or anti-polarisation tilt coupling. The lap belt retractor is configured to simultaneously retract the lap belts to thereby retain the position of the buckle assembly over the mid abdomen section of an occupant. The LEDs actively show a light display in a closed circuit and show various colors accompanying with various arrangements into abstract symbols for indicating various traffic situations. The personal listening device may represent a speaker of the personal electronic device, a wireless hearing aid, a wireless cochlear implant, a wired hearing aid, a wireless headset, or a wired headset, to name only a few examples.