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Sign, Signal, and Luminaire Supports, Utility Poles,
Trees, and Similar Roadside Features
RDG Chapter 4
Roadside Appurtenances
• Sign and Luminaire Supports
• Traffic Signal Supports
• Mailbox Supports
• Utility Poles
• Trees
crash
Stub Height Criteria
4” max.
5’ min.
Stub
Sign Supports
Types of Sign Supports
•Overhead Signs
•Large Roadside Signs
•Small Roadside Signs
Portland/Oregon street sign
Tysons/Lessburg street sign
Ground-Mounted Breakaway Signs
Wind
Strong in Moment
Vehicle ImpactWeak in Shear
Car position 1
Car position 2
7’
Uni-directional slip base
Frangible coupling
Old Mill Bottom Road Sign
Lower signs
Small Sign Supports
•Base Bending
•Slip Base
•Fracture
Breakaway Hinge Point on Slopes
Roadway
20’
7’
Safer Roads
14
2 concerns
Luminaire Supports
Types of Breakaway Luminaire Supports
• Transformer Bases
• Slip Bases
• Frangible Couplings
• Fiberglass Poles
4” Stub Requirement