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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
Stub Height Criteria 4 max. 5 min. Stub
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 Impact Weak in Shear
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Car position 2
Car position 3
7 Car diagram
Uni-directional slip base
Old Mill Bottom Road Sign
Small Sign Supports Base Bending Slip Base Fracture
Breakaway Hinge Point on Slopes Roadway 20 7 Safer Roads 1 4
Types of Breakaway Luminaire Supports Transformer Bases Slip Bases Frangible Couplings Fiberglass Poles
4 Stub Requirement
Barrier Warrants. Potential Hazards –Bridge Abutments/Piers/Approach Railing –Large Drainage Structures –Non-Breakaway Sign and Luminaire Supports –Embankments.
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WORK ZONE Safety Training This material was produced under grant SH SH9 from the Occupational Safety and Health Administration, U.S. Department.
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Shear Force and Bending Moments Consider a section x-x at a distance 6m from left hand support A 5kN 10kN 8kN 4m5m 1m A C D B R A = 8.2 kNR B =14.8kN E.
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