Among them were sam schwartzs discussions onthe importance of maintaining lane and road markers and protecting roads from unanticipated sources of clutter and confusion such as road signs defaced with graffiti that would confuse an automated vehicle image processing systemthe criticality of rethinking land use and street real estate allocations among vehicles bicyclists and pedestriansthe intricate understanding of the nonverbal cues pedestrians and drivers interpret when a driver is edging toward a turn and a pedestrian is trying to cross the street in the crosswalk