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According to research by Keep America Beautiful, Inc., people litter because:
Litter is blown away by wind and traffic or carried by water. It moves until trapped by a curb, building or fence. Once litter has accumulated, it invites people to add more.
Copyright San Francisco recycling program
Litter is a costly problem. Transportation departments spend millions of tax dollars and many hours each year picking up litter. This time and money could be spent to improve Indiana's roadways or rest areas if people would take the time to throw their trash in a designated bin.