Use your camera's flash as a safety strobe-light during nighttime walks, runs, bicycle rides, etc.
"In 2010, 4,280 pedestrians were killed in traffic crashes in the United States, and another 70,000 pedestrians were injured. This averages to one crash-related pedestrian death every 2 hours, and a pedestrian injury every 8 minutes." - 2010 Traffic Safety Fact-sheet, National Highway Traffic Safety Administration, available at http://www-nrd.nhtsa.dot.gov/Pubs/811625.pdf .
Other staggering statistics from the 2010 NHTSA study cited above:
-Between 2001-2010, at least 46,390 pedestrians were killed in traffic accidents!
-The majority of pedestrian fatalities occur during nighttime hours. Over 30% of fatal pedestrian accidents happen between 8 p.m. and midnight.
-Utilized Camera.setPreviewTexture() method to allow application to work with Nexus devices.