MUTCD R5-1a: WRONG WAY Sign

The R5-1a sign is covered in Section 2B.47 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 WRONG WAY (R5-1a) sign (see Figure 2B-13) may be used as a supplement to the DO NOT ENTER sign where a crossroad intersects a one-way roadway in a manner that does not physically discourage or prevent wrong-way entry (see Figures 2B-14 a nd 2B-20 ).
• Guidance · Recommended (should)
  If used, the WRONG WAY sign should be placed at a location along the one-way roadway farther from the crossroad than the DO NOT ENTER sign (see Section 2B.46).

Placement and mounting

• Guidance · Recommended (should)
  The WRONG WAY sign should be placed on the same side of the road as the DO NOT ENTER sign.Figure 2B-14. Locations of DO NOT ENTER and WRONG WAY Signing for Divided Highway Crossings that Function as Two Separate Intersections Legend Direction of travel Optional Vehicle path of left turn (see Section 2A.23) Note: Pavement marking provisions are found in Part 3. The pavement markings illustrated on this figure are…
• Guidance · Recommended (should)
  Section 2B.48 contains information regarding an optional lower mounting height for WRONG WAY signs that are located along an exit ramp facing a road user who is traveling in the wrong direction.

Where to read the rest

• Full text: MUTCD Section 2B.47: WRONG WAY Sign
• Minimum sign sizes by roadway type are in the size section for this chapter: Section 2B.03
• Mounting height, lateral offset and retroreflectivity for any sign: MUTCD sign placement guide