New work with Monica Menendez (NYUAD) and her team (Kaidi Yang, Igor Dakic) proposes an online dispatching policy for modular autonomous bus units that is aware of the regional traffic congestion. This is achieved through an embedded 3D macroscopic fundamental diagram that is assumed to track the regional traffic. The topic is timely considering companies that are developing the modular bus technology are piloting it in Milan (Next Future Transportation) and to be commercially available in 2022, which will need effective operational policies and algorithms to fully leverage its benefits. The research is partially supported by NSF CMMI-2022967.