... Numerous studies of zonal CPMs have been conducted at various zone scales, ranging from states (Noland, 2003;Castro-Nuño, Castillo-Manzano, & Fageda, 2018), counties (Aguero-Valverde & Jovanis, 2006;Huang, Abdel-Aty, & Darwiche, 2010;Li et al., 2013), districts (Haynes, Jones, Kennedy, Harvey, & Jewell, 2007, census tracts/wards (Quddus, 2008;Wang & Kockelman, 2013), and postal codes (Lee, Abdel-Aty, & Choi, 2014) to traffic analysis districts (TADs) (Cai, Abdel-Aty, & Lee, 2017a;Cai, Abdel-Aty, Lee, & Eluru, 2017b), TAZs (Abdel-Aty, Siddiqui, Huang, & Wang, 2011;Guo, Pei, Yao, & Wong, 2015;Guo, Xu, Pei, Wong, & Yao, 2017;Hadayeghi et al., 2010;Huang et al., 2016;Xu & Huang, 2015), block groups (Levine, Kim, & Nitz, 1995), and local health areas (MacNab, 2004). ...