Prevent iPhone from automatically routing sound to car audio upon connection

Not a question but an empirically found solution for issue that I messed with since I bought my 11. I want it to connect to car bluetooth for hands-free calls, but I dont want it to play notifications and directions through car audio. Because they interrupt car radio/music or play mixed, thus less distinct. Found many same questions here, so here are steps:

• create automations shortcut for Bluetooth and choose your car paired
• add action -> scripting -> set playback destination
• check out iphone is chosen

I already have such shortcut to start roadcam alert software. So just added a step.