What it looks like
A vertical white rectangle with black legend reading STOP HERE ON RED, sometimes shown with a stop-bar symbol.
When you'll see it
Posted at signalized intersections where the stop line sits well back from the signal, such as beside a crosswalk or railroad track.
What to do
When the traffic signal is red you must stop at this marked point rather than pulling forward closer to the intersection.
Source: Manual on Uniform Traffic Control Devices (MUTCD), 11th Edition — FHWA.
