Google Glasses don't include user-awareness detection or a non-optional cleaning of the slate, if you will, to regularly alert users that they are in fact still a physical presence in a physical world and subject to external physical forces. Until someone comes up with a pedestrian version of the rumble strip, it's going to be on hapless passersby and fixed objects to jolt users back to reality, as deftly and comically illustrated by Tom Scott's parody of the brain-blind Google Glasses user.
Fortunately, Google Glasses can show the pedestrian user the way to places like the hospital or the courthouse. This is good because users may well find themselves in need of an emergency room or directions to the courtroom where they're scheduled to meet the person they ran into, tripped over, or knocked down a few weeks ago.
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