Since the chances of being struck and killed as a pedestrian increase by 1100% after dark, according to the National Safety Council, you should take advantage of the Federal Highway Administrations statement that reflectorization has been shown to increase the visibility of a pedestrian by a factor of five. 

In the Scandanavian countries, where reflectors have been used by all members of the population since the early '60's, the nighttime pedestrian accident rate is 50% less than ours here in the United States. In the US, over 60% of pedestrian accidents and deaths occur in the dark says the National Safety Council. Wear or carry a reflector beginning today! Be Safe - Be Seen! 
Here are some pertinent facts from independent sources: 
"Chances of being struck and killed as a pedestrian increase 1100% after dark"- National Safety Council. 
"Poor visibility of pedestrians is a major contributing cause of higher nighttime accident rates"-U.S. Public Health Service. 
"In a survey of safety specialists, reflectorization countermeasures were identified as having the highest overall rating as a means for reducing school children accidents during darkness"-U.S. Department of Transportation. 
"A person dressed completely in black wearing a thumb sized reflctor is detected at longer distances than a person dressed completely in white"-Federal Highway Administration. 
"8 out of 10 drivers who struck people at night didn't see them. 90% of motorists who hit people at night are not ticketed for any traffic violations"-Indiana State Police Reports 
Cornell University Cooperative Extension Program has published a report on "Actionwear: Clothing for Fitness". The report states that pedestrians walking along a road in dark clothing at night are first seen approximately 55 feet away, giving a driver less than one second reaction time. A driver traveling at 60mph needs over 260 feet to stop. They list the following colors and visibility distances: BLACK/BLUE - 55 Feet; RED - 80 feet; YELLOW -120 FEET; WHITE - 180 feet; REFLECTORIZED - 500 FEET OR MORE.