A rapid tire inflation plant comprising a low pressure high flow inflating gas source, an inflation device, a motor, a compressor driven by said motor and a control circuit arranged to control feed of low pressure inflating gas from said inflating gas source to said compressor and the feed of inflating gas at a relatively high flow and pressure to said inflation device. The method embeds at a server computer a marker in selected frames of a video stream. It is desirable to remove such BB intervals from a BB interval time series used to calculate a heart rate variability metric. Silicon nitride oxidizes to produce nitrogen oxides when heated. The profile adjustment feature may automatically adjust the height of the vehicle as a function of vehicle speed. The conveyor includes bases 19 and 20 supported by resilient mountings on a stationary structure 37.