As getting the authorizations to install streets screens or even using existing ones seems to be quite a challenge, I'm exploring a mobile version of the project:

The idea would be to have a setup that fits in a van and that can be powered by a big battery or a small gas powered generator.

The setup would include:

• an outdoor screen
• a load balancing router (pfSense or OpenWrt based)
• 2 x 4G/LTE modem
• IP webcam
• a power generator or a big ev battery

The video would either be streamed to a server that would distribute it to the other peers, or, if there is only 2 participants, it could just be sent to the other peer through a VPN. I think it would be better to have a video server to avoid all the problems related to mobile providers that don't provide a real, non NATed internet.

This project would need people to deploy the setup, present the project, and the twinned city to the people. and it could not be left unattended, but I think it is a solution that could be a good match for cities that want to get closer links with their twinned cities.

If you are interested and you live in Europe, don't hesitate to contact me to setup a european project, I'm looking for partners.