It would be very cool if there was a 'roadtrip mode' where you could enter the usernames of the people in the car, and generate a playlist of the songs most people in the car like based on shared music taste. It can be editable so people could still queue up songs, but just a baseline to go off of.
Updated on 2019-09-03
Hello and thanks for bringing your feedback to the Idea Exchange.
A similar idea has also been suggested here: https://community.spotify.com/t5/Live-Ideas/Social-One-Phone-Everyones-Songs-Shared-public-Queue/idi...
We have also merged the votes from this idea to that original one. More information about how the Spotify Idea Exchange works can be found: here