  Unanswered questions about how human-AV interaction designers can support
rider's informational needs hinders Autonomous Vehicles (AV) adoption. To
achieve joint human-AV action goals - such as safe transportation, trust, or
learning from an AV - sufficient situational awareness must be held by the
human, AV, and human-AV system collectively. We present a systems-level
framework that integrates cognitive theories of joint action and situational
awareness as a means to tailor communications that meet the criteria necessary
for goal success. This framework is based on four components of the shared
situation: AV traits, action goals, subject-specific traits and states, and the
situated driving context. AV communications should be tailored to these factors
and be sensitive when they change. This framework can be useful for
understanding individual, shared, and distributed human-AV situational
awareness and designing for future AV communications that meet the
informational needs and goals of diverse groups and in diverse driving
contexts.
