Just when you didn’t need to add another worry to your life, crossing the street as a minority may be detrimental to your health.

According to a recent study done by Portland State University-based Oregon Transportation Research and Education Consortium (OTREC), it was found that drivers are less likely to stop for black pedestrians waiting to use a crosswalk than white ones. The study is the first to examine the effects of race on pedestrian crossing experiences.

Three black and three white men were used during the study. They were all of similar age, height and build. They even dressed the men in identical neutral outfits and “without any obvious social or socio-economic characteristics,” and had them cross an unsignalized, marked crosswalk in downtown Portland. Each pedestrian crossed 15 times, resulting in 168 driver subjects overall.

From The Huffington Post:

Per the study, trained observers standing out of sight to oncoming cars recorded whether the first car to approach yielded for the pedestrian, how many cars passed before someone yielded and the number of seconds that before the pedestrian could cross the street.

Observers found that black pedestrians got passed by twice as many cars as white pedestrians, and waited 32 percent longer to cross.

Though the sample size was small, the study has already prompted significant interest from the transportation community. Lead researcher Dr. Kimberly Kahn said she believes it’s an important first step.

“We wanted to test this hypothesis to see if pedestrian’s race would influence driver’s yielding decisions at crosswalks,” Kahn told The Huffington Post by phone. “For this first initial study, we wanted to see if the effect was even there, and even with the relatively small sample size, we saw a significant variation between races.”

Kahn, who studies implicit bias in the field of social psychology, said the results of the study didn’t surprise her, but that the reaction among transportation experts, who haven’t studied these types of biases as much, has been “really striking.”

Nationwide, pedestrians account for 13 percent of all motor vehicle traffic-related deaths, according to the Centers for Disease Control. But African Americans are disproportionately represented in that group, dying at a rate 60 percent higher than non-Hispanic whites, according to a 2014 study from the community development non-profit Smart Growth America.

In addition to concluding that drivers behave differently toward pedestrians based on their race, the OTREC study found that “black pedestrians were passed by twice as many cars and waited nearly a third longer to cross than white pedestrians.”

The team behind the study plans to expand the sample size of the study, and look at race and gender dynamic, if they win a 2 year CDC grant.

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