In a grass-roots gesture of solidarity and remembrance, cyclists place all-white “ghost bikes” at the sites of fatal cycling accidents. The ritual, which seems to have begun in St. Louis in 2003, has since spread to cities around the world, and in recent years has arrived in Boston. “There is nothing organized about it,” said David Watson, who directs the Massachusetts Bicycle Coalition. The ghost bikes are a mysterious custom, appearing without notice, with no indication of who is responsible.
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