  Internet-of-vehicle (IoV) is a general concept referring to, e.g., autonomous
drive based vehicle-to-everything (V2X) communications or moving relays. Here,
high rate and reliability demands call for advanced multi-antenna techniques
and millimeter-wave (mmw) based communications. However, the sensitivity of the
mmw signals to blockage may limit the system performance, especially in
highways/rural areas with limited building reflectors/base station deployments
and high-speed devices. To avoid the blockage, various techniques have been
proposed among which reconfigurable intelligent surface (RIS) is a candidate.
RIS, however, has been mainly of interest in stationary/low mobility scenarios,
due to the associated channel state information acquisition and beam management
overhead as well as imperfect reflection. In this article, we study the
potentials and challenges of RIS-assisted dynamic blockage avoidance in IoV
networks. Particularly, by designing region-based RIS pre-selection as well as
blockage prediction schemes, we show that RIS-assisted communication has the
potential to boost the performance of IoV networks. However, there are still
issues to be solved before RIS can be practically deployed in IoV networks.
