Back and forth patterns have always been my preference and figured others might feel the same.
Note: You may not redistribute this config. If you have a friend who likes my set up but wants something slightly changed, leave a comment and let me know. I'll happily upload the changes for you or your friend.
How to install: When on the vehicle selection screen, click the vehicle you want-->edit lights.
Click the diamond above the roof of the car you want the lightbar on.
Click one of the preset options.
Click the "edit selected" button in the top right of the light bar you've chosen.
At the top right you'll see the option "import lighting pattern". Press that, then select my config file.