Jarrett Walker Jarrett Walker is a consulting transit planner, helping to design transit networks and policies for a huge range of communities. He is the author of the Human Transit Blog. (humantransit.org). Recent Posts STREETSBLOG USA Opinion: The Bus Driver Shortage is an Emergency By Jarrett Walker | Dec 15, 2021 | No Comments Many US transit agencies are looking at devastating service cuts due to a shortage of bus drivers. And there's something simple but powerful that sustainable transportation advocates can do about it.