The annual number of motorcycle rider fatalities in the United States increased from 2294 in 1998 to 5290 in 2008 (National Highway Traffic Safety Administration, 2010). Many multi-vehicle motorcycle crashes involve right-of-way violations where another vehicle turns in front of, or crosses the path of an on-coming motorcycle. Improving the frontal conspicuity of motorcycles with auxiliary forward lighting may reduce these types of crashes. This book describes some recent studies sponsored by NHTSA on motorcycle conspicuity.