Road trips for African Americans were fraught with inconveniences and dangers because of racial segregation, racial profiling by police, the phenomenon of travelers just "disappearing," and the existence of numerous sundown towns. According to author Kate Kelly, "there were at least 10,000 'sundown towns' in the United States as late as the 1960s; in a 'sundown town' nonwhites had to leave the city limits by dusk, or they could be picked up by the police or worse. These towns were not limited to the South—they ranged from Levittown, N.Y., to Glendale, Calif., and included the majority of municipalities in Illinois."