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  1. Vertical Clearance - Federal Highway Administration

  2. Chapter 2A - MUTCD 2009 Edition - FHWA - Transportation

  3. FHWA - MUTCD - 2003 Edition Revision 1 Chapter 2A - Transportation

  4. Chapter 4: Construction Details, Section 56: Overhead Sign

  5. Sign Guidelines and Applications Manual: Vertical Clearance

  6. Manual on Uniform Traffic Control Devices (MUTCD) - FHWA

  7. Vertical Clearance Signs - Larson Design Group