  Signalized intersections are major sources of traffic delay and collision
within the modern transportation system. Conventional signal optimization has
revealed its limitation in improving the mobility and safety of an
intersection. Unconventional arterial intersection designs (UAIDs) are able to
improve the performance of an intersection by reducing phases of a signal
cycle. Furthermore, they can fundamentally alter the number and the nature of
the conflicting points. However, the driver's confusion, as a result of the
unconventional geometric designs, remains one of the major barriers for the
widespread adoption of UAIDs. Connected and Automated Vehicle (CAV) technology
has the potential to overcome this barrier by eliminating the driver's
confusion of a UAID. Therefore, UAIDs can play a significant role in
transportation networks in the near future. In this paper, we surveyed UAID
studies and implementations. In addition, we present an overview of
intersection control schemes with the emergence of CAV and highlight the
opportunity rises for UAID with the CAV technology. It is believed that the
benefits gained from deploying UAIDs in conjunction with CAV are significant
during the initial rollout of CAV under low market penetration.
