If you installed from fdroid you have to ensble unknown sources in androud auto settings. These are the instructions from another app, but the procedure is the same

It is possible to use URL Radio on Android Auto if you have enabled unknown sources in Android Auto developer settings.

To enable:

Go to Android Auto settings and tap Version about 10 times to enable developer settings.

Tap on the hamburger menu on the top right and tap on Developer Settings.

Enable unknown sources.

Its great right?

Just FIY, RM transit is also active on the fediverse witha mastodon and a peertube accounts

• https://masto.canadiancivil.com/@reece
• https://video.canadiancivil.com/c/transit/videos

And for sure you know that notjustbikes is on mastodon too notjustbikes@notjustbikes.com

Actually the ad mentions

• 56 people can "seat" on the streetcar (and many more could stand if needed)
• cars are pretty full with an unrealistic occupancy of 2 people per vehiclr

And finally 3 people in a bus occupy less room than 3 cars and consume more or less the same amount of fuel...