“…Further analysis should consider: (1) change of departure pattern under different transit subsidy policies, (2) non-linear body congestion (Huang, 2002;de Palma et al, 2015), (3) heterogeneous commuters Xiao and Zhang, 2014;Du and Wang, 2014;Wang and Du, 2016), (4) oligopoly transit operators (Liu et al, 2011), (5) three travel modes: auto-only mode, transit-only mode, and park-and-ride mode (Liu et al, 2009;Lu et al, 2015;Wang and Du, 2013), (6) congestion interactions between autos and buses Basso et al, 2011), (7) parking fees at the destination (Qian et al, , 2012Qian and Rajagopal, 2014). …”