In the build up to a new campaign, one of my players asked me for an ability to help them manipulate traffic. Since there is no canon ability that fits, I decided to make one up.
The Song of Storms (Liber Canticorum pg 56) seemed the most similar to the desire effect for the Song of Traffic. I have drawn heavily from the existing song to design this one. Since the Song of Storms is flagged as potentially overpowering in the hands of a new character, I would carry that warning over into this new song as well. Do not let new characters have access to this song without giving the matter careful thought, and don’t give the song out at all if you suspect min/maxing.