After the 1st completed drive
The first drive for a new customer is an exciting time, feeling accomplished. We should surface refer a friend at this point as people are more likely to share in a positive frame of mind.
Opening the app for a 2nd time (2nd session)
If a user is coming back to the app, this is an indicator that the user wants to use the app again and more likely to share. Upon reopening the app we show the user an overlay to refer a friend, incentivising them to earn money for you and your friend.
Refer from the side menu
To allow users to refer a friend instantly, the option is always available from the menu.