  Twenty-two years after the advent of the first-generation vehicular network,
i.e., dedicated short-range communications (DSRC) standard/IEEE 802.11p, the
vehicular technology market has become very competitive with a new player,
Cellular Vehicle-to-Everything (C-V2X). Currently, C-V2X technology likely
dominates the race because of the big advantages of comprehensive coverage and
high throughput/reliability. Meanwhile, DSRC-based technologies are struggling
to survive and rebound with many hopes betting on the success of the
second-generation standard, IEEE P802.11bd. While the standards battle to
attract automotive makers and dominate the commercial market landing, the
research community has started thinking about the shape of the next-generation
vehicular networks. This article details the state-of-the-art progress of
vehicular networks, particularly the cellular V2X-related technologies in
specific use cases, compared to the features of the current generation. Through
the typical examples, we also highlight why 5G is inadequate to provide the
best connectivity for vehicular applications, and then 6G technologies can fill
up the vacancy.
