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Claus's article, linked to below, discusses the possibility that 5.9 GHz will be opened up for Wi-Fi.

https://wifinowevents.com/news-and-blog/fccs-jessica-rosenworcel-reopens-case-for-wi-fi-in-5-9-ghz-band/

Dedicated Short-Range Communications (DSRC) is a technology promoted by the Department of Transportation (DoT), but which has never been used much since its inception in 1999.   It uses a 75 MHz span in that band.   So far there are only a couple thousand devices that use it, compared to the millions of Wi-Fi devices out there.

I'm sure the DoT will raise a stink, if they are asked to vacate it.

Here is a copy of the original FCC announcement in 1999 about it:

https://transition.fcc.gov/Bureaus/Engineering_Technology/News_Releases/1999/nret9006.html

DSRC is IEEE Standard 802.11p.  I don't know CWNP policy on posting reference links here.

Like all 802.11 technologies, transportation for one (V2V and V2I) do not see DSRC as the correct solution for mission-critical operations focused on safety and reliability.  802.11 technologies are based on CSMA/CA.

Safety and reliability mission/business-critical operations rely on guaranteed QoS.  Reason why light rail and railroad rolling stocks worldwide do not use 802.11 technologies on their V2I and V2V infrastructure.

 I do have an IEEE WCP as well as CWNP, along with FE/EIT.