[scruple]

I'm originally from the Pittsburgh area and the Pittsburgh Left [0] throws me off guard every single time I visit.

[0]: https://en.wikipedia.org/wiki/Pittsburgh_left

[black6]

This is one of the unspoken rules of the road I learned on a trip to Puerto Rico, only it's not only at traffic signals -- any time a vehicle is signaling a left turn common practice is to slow/stop and allow it to make the turn.