Review of current deliberations on key performance characteristics of an audible signal for quiet vehicles.

OICA presentation on its review of feasible specifications currently under discussion among vehicle makers to describe the performance characteristics of an audible signal for quiet vehicles.

Chart of third-octave filter bands for use in discussions of audible signals for quiet vehicles.

Tables and figures illustrating relationships between acoustic signals and distance from their sources.

Presentation of the results of an inquiry by the German Federal Highway Research Institute into the perception of acoustic signals by visually impaired pedestrians.