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SHM is a new measure, based on the concept of near-misses, incorporating:
Proximity (separation distance)
Motion (relative speed)
Near-misses have been shown to be effective predictors of the likelihood and severity of incidents in civil aviation and the chemical process industry.
Free of Assumptions
No other measure in the industry does all of those at once - or comes anywhere close.
Existing measures all have serious limitations:
TTC, PET, ISM, RSS, IMU, AV Disengagements, Traffic Conflicts...
These trailing indicators incur pain and loss in society, and are not an ethically acceptable approach.
A continuous measure of degree of near-miss allows us to measure and communicate about traffic safety objectively.
Near-misses occur continuously and are predictive.
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