MUTCD W13-1P: Advisory Speed Plaque and Confirmation Advisory Speed Plaque
The W13-1P sign is covered in Section 2C.59 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 Advisory Speed (W13-1P) plaque (see Figure 2C-1 ) may be used to supplement an advance warning sign to indicate the advisory speed for a condition.
- Option · Permitted (may)The Confirmation Advisory Speed (W13-1aP) plaque (see Figure 2C-1 ) may be used to supplement a One- Direction Large Arrow (W1-6) sign on the outside of a turn or curve in line with and at approximately a right angle to approaching traffic.
Placement and mounting
- Standard · Required (shall)The use of the Advisory Speed and Confirmation Advisory Speed plaques for horizontal curves shall be in accordance with Section 2C.06 and Table 2C-6. The speed differential in Table 2C-6 shall be the difference between the advisory speed for the horizontal curve and the posted speed limit, statutory speed limit, or the 85th percentile speed on the approach to the curve. The Advisory Speed plaque shall also be used…
- Standard · Required (shall)Except in emergencies or when the condition is temporary, an Advisory Speed or Confirmation Advisory Speed plaque shall not be installed until the advisory speed has been determined by an engineering study.
- Standard · Required (shall)The Advisory Speed plaque shall only be used to supplement an advance warning sign. The Advisory Speed plaque or the Confirmation Advisory Speed plaque shall not be installed as a separate sign installation.
Where to read the rest
- Full text: MUTCD Section 2C.59: Advisory Speed Plaque and Confirmation Advisory Speed Plaque
- Minimum sign sizes by roadway type are in the size section for this chapter: Section 2C.03
- Mounting height, lateral offset and retroreflectivity for any sign: MUTCD sign placement guide
Related signs in Section 2C.59
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.