Characterization of Black Spot Zones for Vulnerable Road Users in São Paulo (Brazil) and Rome (Italy). - Cláudia A. Soares Machado; Mariana Abrantes Giannotti; Francisco Chiaravalloti Neto; Antonino Tripodi; Luca Persia; José Alberto Quintanilha (ISPRS Int. J. Geo Inf., 2015)