Traffic Barrier Guidelines Tracy Borchardt February

Traffic Barrier Guidelines 2 BWA Process Usage Guide

Barrier Usage Guide 3 Guardrail Traffic Barrier Terminals Attenuators Cable Median Barrier Concrete Barrier

References AASHTO Roadside Design Guide, 4 th Edition –

Traversable Element RDG-Figure 4-1. Breakaway Support Stub Height Measurements 5 4 in. 5 ft.

Traversable Element (cont.) 4’ 1:6 (V:H) 6

Traversable Element? 7

8

9 YES

Warrant Analysis Level 10

Flowchart for Analysis of Existing Obstacles 11

Proliance Updates – October

Proliance Updates – October

Level 0 Table Analysis Level then Level

RSAP Guidance – Determination of Alternatives 15

Presentation of Barrier Warrant Analysis Checklists  Cover Sheet  Table of Contents  Disposition  Location Plan  Data Sheet  Calculation Sheet  Site Plan  Summary Site Plan  Cross Sections  Level 0 Table  Level 1 Analysis  Level 2 Analysis  Level 3 Analysis 16

Barrier Warrant Amendment Process 17 What initiated change to design? Who initiated change? Who completes Amendment to BWA? In addition to GEC, who reviews BWA Amendment? Field change CM or Contractor DSECM Value Engineering Proposal Contractor Contractor’s Designer DSE / CM Performance Based Design Contractor Contractor’s Designer DSE / CM

Gutter and Guardrail G-3 Modified GutterG-3 Gutter 18 Gutter may be constructed in conjunction with guardrail, but is not required solely because of the presence of guardrail and vice versa. Guardrail shall not be constructed to shield improperly placed gutter or curb. Guardrail

Barrier Clearance Distance Measured from back of post to face of obstruction. 19

Barrier Clearance Distance Guardrail System Post SpacingDesirable Barrier Clearance Distance Minimum Barrier Clearance Distance MGS- 31” Type A 6’- 3”42” 28” MGS- 31” Type B ½ Post Spacing 3’- 1 ½”30” 23” MGS- 31” Type C ¼ Post Spacing 1-’6 ¾”24” 14” 20 Minimum Barrier Clearance distances are only to be used for Existing Obstacles

Galvanized Steel Plate Beam Guardrail 21 Transition to ½ -Post Spacing

Galvanized Steel Plate Beam Guardrail 22 Transition to ¼-Post Spacing

Roadside Safety Analysis Program (RSAP) 23

Traffic Barrier Guidelines – Next Steps Hands-on Workshops Late Summer

Traffic Barrier Guidelines – Next Steps Construction Manager’s Training March 22 nd and TBD 25

Questions ? 26