The busy crosswalk at 77 Massachusetts Avenue serves as a primary entrance for MIT, and is active throughout the day. An audible safe signal helps the blind navigate but also serves the sighted, as routine often makes a visual check less apt. I intervene to generate the signal myself, through walking - each foot signals one note of the two-tone signal.
For the course of a day, I wait with the other pedestrians until it is safe to cross, then walk with them, generating the signal as I go. In each case I try to walk in step with another pedestrian, until reaching the other side, when I resume a pace suitable to replicating normal function of the device.

Kevin Hamilton, researcher and instructor
at the University of Illinois, Urbana-Champaign* kham@uiuc.edu
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