A diagram of a <a href="https://en.wikipedia.org/wiki/HAWK_beacon" class="extiw" title="w:HAWK beacon">Pedestrian Hybrid Beacon</a>, showing the color, shape and position of the lights.
<a href="https://en.wikipedia.org/wiki/United_States_Department_of_Transportation" class="extiw" title="w:United States Department of Transportation">United States Department of Transportation</a>
<a rel="nofollow" class="external text" href="https://mutcd.fhwa.dot.gov/pdfs/2009r1r2/part4.pdf">Manual of Traffic Control Devices - 2009 Edition, Revision 2. Part 4 - Traffic Signals</a>