Children and people with mobility impairments may move unpredictably
Aliases: atypical motion trajectories · child motion behavior · mobility diversity
What it is
Motion variability of children and people with mobility impairments means a robot cannot assume the steady gait, eye height, avoidance speed, or cue comprehension of a nondisabled adult. “Unpredictable” describes incomplete system models, not irrational people.
Why it happens
Children may reverse, crouch, or pursue a moving object. People using canes or walkers, or managing balance limitations, may need more space to turn, stop, and recover; after a fall, the body leaves common detection heights. Predictors trained on adult pedestrian traffic can fail jointly at detection, classification, and future position for short stature, nonperiodic gait, and mobility aids, sometimes with unwarranted confidence.
Studying it
Under ethics review and collision-free protocols, samples can be stratified by stature, gait pattern, turn radius, stop-start motion, reversal, fall posture, and mobility aid. Human or aid recall, forecast error, minimum separation, and robot yield time should be reported for the worst subgroup, not only in aggregate. Playback, simulation, and surrogates cover hazardous boundaries before participation.
Where it stops holding
Age or disability category does not determine individual behavior and must not restrict legitimate access. Conservative planning need not force everyone to move at the slowest pace; it expands margin when recognition is uncertain or evacuation ability is limited. Better vision models still do not replace geometric, speed, and passive-force protection.
Applying it
- Remove assumptions that the other person will yield; cover short, stationary, reversing, fallen, and irregular-gait cases.
- On uncertain detection or forecasting, increase clearance, slow, and yield rather than inferring cognition or authorization from appearance.
- Validate on the site's motion distribution by subgroup, examining misses, minimum clearance, and events that force abrupt stopping or twisting.
Related
- Same group: X5.06.2 Wheelchairs, guide dogs, and similar aids must be recognized · X5.06.3 Safety parameters must be set for the most vulnerable person
- Adjacent: X5.01 Physical safety boundaries · X5.02 Movement through shared spaces
- Search terms:
inclusive human detection·mobility impairment·trajectory prediction bias