"I've figured out that there are more of them when it's a payday," photographer Alejandro Cartagena writes to me from Monterrey, Mexico, where he is based.
More carpoolers, that is — the subject of his latest project, which started somewhat accidentally. Cartagena was commissioned by a group of researchers about usage of a Monterrey street. "I wanted to see the car in the context of the street and the urbanscape," he explains. "That took me to find higher points of view, where I found these workers."