Louis Challis b. 1936

  • Designer
Challis was an engineer with a graduate degree in architectural science, specialising in acoustics. Working with David Wood, Nielsen Design Associates and others, he was a key team member in the development of the NSW Dept of Main Roads' PB/5 pedestrian button, a “Audio-Tactile Pedestrian Detector” (ATPD). This device was developed in the 1970s and remains in use.

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