No Stopping Any Time Sign
MUTCD R7-4a
You may not stop here for any reason at any time — not even briefly to load, unload, or wait. It is the strictest stopping restriction.
What it looks like
A vertical white rectangle with black legend reading NO STOPPING ANY TIME, often paired with a directional arrow.
When you'll see it
Posted along curbs on busy arterials, near intersections, and in tunnels where any halted vehicle would create a hazard.
What to do
You must not stop here for any reason at any time, not even briefly to load, unload, or wait; keep moving through this zone.
Related signs
Source: Manual on Uniform Traffic Control Devices (MUTCD), 11th Edition — FHWA.