What's more, the roadways between the high- and low-income neighborhoods differed in design, both in the number of lanes the pedestrian had to cross and the posted speed limit, as the study acknowledges. The researchers also noted, citing other research, that the disparity between yielding rates in the different neighborhoods could be explained by several factors, such as people in high-income areas more often having private cars and driving more compared to people in low-income neighborhoods, where there are also generally more pedestrians.