This is a serious question. ICE has been doing checkpoints around DC, and one of the primary ways to protect against them is going up several blocks each way to warn people about them. But how do you pass the message to people in cars?
We're working on upping our sign game, but people won't always have signs with them. I stood at an intersection this morning with a hastily made, barely legible warning on a paper bag.
A widely understood hand sign could help with this.
