  Millimeter wave provides high data rates for Vehicle-to-Everything (V2X)
communications. This paper motivates millimeter wave to support automated
driving and begins by explaining V2X use cases that support automated driving
with references to several standardi-zation bodies. The paper gives a
classification of existing V2X stand-ards: IEEE802.11p and LTE V2X, along with
the status of their com-mercial deployment. Then, the paper provides a detailed
assessment on how millimeter wave V2X enables the use case of cooperative
perception. The explanations provide detailed rate calculations for this use
case and show that millimeter wave is the only technology able to achieve the
requirements. Furthermore, specific challenges related to millimeter wave for
V2X are described, including cover-age enhancement and beam alignment. The
paper concludes with some results from three studies, i.e. IEEE802.11ad (WiGig)
based V2X, extension of 5G NR (New Radio) toward mmWave V2X, and prototypes of
intelligent street with mmWave V2X.
