Connected and automated vehicles (CAV) are expected to deliver a much safer, more efficient, and eco-friendlier mobility. Being an indispensable component of the future transportation, their key driving features of CAVs include not only the automated functionality but also the cooperative capability. Despite the CAVs themselves are emerging and active research areas, there is a lack of a comprehensive literature review on the digital infrastructure that enables them. In this paper, we review the requirements and benefits of digital infrastructures for the CAVs including the vehicle built-in, roadside-based, operational and planning infrastructures. We then highlight challenges and opportunities on digital infrastructure research for the CAVs. Our study sheds lights on seamless integration of digital infrastructure for safe operations of CAVs.

Comment: 24 pages, 2 figures, 1 table