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MUTCD R15-7: Divided Highway with Light Rail Transit Crossing Signs

The R15-7 sign is covered in Section 8B.15 of the Manual on Uniform Traffic Control Devices, 11th Edition. Below are the provisions from that section that describe when the sign is used and how it is placed.

What it means and when it is used

Option · Permitted (may)
The Divided Highway with Light Rail Transit Crossing (R15-7 or R15-7a) sign (see Figure 8B-1) may be used as a supplemental sign on the approach legs of a roadway that intersects with a divided highway where LRT equipment operates in the median. The sign may be placed beneath a STOP sign or mounted separately.
Guidance · Recommended (should)
The number of tracks displayed on the R15-7 or R15-7a sign should be the same as the actual number of tracks.Page 1004 MUTCD 11th Edition

Where to read the rest

Full text: MUTCD Section 8B.15: Divided Highway with Light Rail Transit Crossing Signs
Mounting height, lateral offset and retroreflectivity for any sign: MUTCD sign placement guide

Source: Manual on Uniform Traffic Control Devices, 11th Edition (Federal Highway Administration, December 2023, public domain). Excerpts are shortened and shown out of context; read the full section before specifying a sign. Your state may still be operating under the 2009 edition or a state supplement. Official manual: mutcd.fhwa.dot.gov.