MUTCD I2-3: Grade-Separated Roadway Identification Signs

The I2-3 sign is covered in Section 2H.10 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 Grade -Separated Roadway Identification (I2-3 and I2-3a) signs (see Figure 2H-4) may be used to identify a grade separation of another highway or other transportation facility such as a railway, bikeway, or pathway.
• Guidance · Recommended (should)
  Except as provided in Paragraph 4 of this Section, when used to identify an overcrossing structure, the I2-3 sign should be mounted above the travel lanes or shoulder of the highway below.

Placement and mounting

• Guidance · Recommended (should)
  When used to identify an undercrossing structure, the I2-3 or I2-3a sign should be post-mounted in advance of the structure as near to it as practicable.
• Option · Permitted (may)
  When used to identify an overcrossing structure, the I2-3 or I2-3a sign may be post-mounted in front of an overcrossing or may be mounted to the abutment of the overcrossing facing approaching traffic.Figure 2H-4. Examples and Typical Placement of Grade Separation Identification Signs Crossroad over highway Grade Separation Identification sign (mounted to bridge fascia) Grade Separation Identification sign (alternate…
• Option · Permitted (may)
  Project Information signs installed more than one week prior to commencement of work may include a start date.

Where to read the rest

• Full text: MUTCD Section 2H.10: Grade-Separated Roadway Identification Signs
• Mounting height, lateral offset and retroreflectivity for any sign: MUTCD sign placement guide

Related signs in Section 2H.10