RD436 - Midwest Guardrail System - Buried in Backslope (BIB) Terminal - Detail A

Sep 17, 2026

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ODOT Oregon Standard Drawings document detailing the Midwest Guardrail System buried in backslope (BIB) terminal. Includes sectional references and a speed table showing posted speed ranges (MPH) linked to flare rate and slope conditions, along with installation specifics such as terminal anchor components, pipe sleeve, spacer, washer, and field drilling requirements. Provides general notes governing terminal selection, bolting procedures and retightening timing, allowed post and rail configurations, flare rate guidance, and materials compliance per Oregon Standard Specifications, with revision and responsibility notes.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages1

Reading Time3 min

AccessFree to download

Table A

Posted Speed (MPH)

General Notes for All Details on This Sheet

Terminal anchorage and guardrail standards

Installation, bolting, and flare rate guidance

Materials and revision information

3'-11"3'-1↓" P2 P3 9'-42"span Bottom of ditch_ E 10-JULY-2026 Adjacent traffic flow PLAN Terminal anchor (See std .dwg.no.RD437) 3'-1%"3'-12" RD436 dgn ll ll jP2 出P3 TABLE A POSTED SPEED (MPH) 70 60 12:1 or Flatter 55 11:1 or Flatter 50 10:1 or Flatter 45 40 or less SECTION A-A SECTION B-B SECTION C-C SECTION D-D SECTION E-E Washer 58"×5"hex bolt— Pipe sleeve spacer P1 Offset Dist. "W" Field drill ³4"dia. 14'max. hole in post # DETAIL "A" GENERAL NOTES FOR ALL DETAILS ON THIS SHEET: 1.See Std.Dwg.RD437 for Buried-in-backslope terminal anchorage parts. See appropriate guardrail standard drawing(s)for additional details not shown. 2.On two way,two lane highways,both ends of guardrail runs shallbe provided with a flared or non-flared terminal from ODOT's QPL if not buried,as detailed on plans. 3.Eight foot long guardrail post required when connected to rub rail. 4.The flare rate of the guardrail may be increased after crossing the ditch bottom to shorten the length of the terminal. 5.Trailing ends(freeways,multilane and similar one-way facilities)not exposed to opposing traffic: (a)Guardrail terminals,use a Downstream Anchor Terminal (DAT)(Std.Dwg.RD438), Type B end piece and do not flare. (b)At bridge ends,omit Transition Guardrail &Type 3 guardrail and substitute the normal required guardrail. 6.(a)All bolts except adjustment bolts shall be drawn tight on rails and 山P1 components on initial installation. (b)Final tightness check on rail and component bolts and retightening as required to be done 30 days after initial installation. Steel posts only 7.Bend the downstream end of the bottom rail to the backside of the post and (Without blocks) bolt to post. 8.Field drilled steel posts are allowed for bottom rail element. Use zinc rich paint to coat field drilled holes in posts or rail elements. Galvanizing required for plate and hardware. FLARE 9.Hold the top guardrail element constant with the typical barrier installation. RATE Go up stream 1 post and add a bottom rail element under the standard guardrail a:b element when the bottom of the top guardrail element exceeds 18 inch,at any 15:1 or Flatter point of the slope,point(Y)elevation view.Slope both elements down to 14:1 or Flatter maintain a maximum height of 45 inch in front of the toe of slope if the top of installation exceeds 45 inch from the ground,at any point in the installation. 10.Use in established slopes.Do not build a mound to use the Buried-in-backslope terminal.Do not use the Buried-in-backslope terminal in locations where the 9:1 or Flatter backslope is flatter than 3:1. Allmaterials shallbe in accordance wth the current Oregon Standard Specifications. The selection and use of this OREGON STANDARD DRAWINGS Standard Drawing,while MIDWEST GUARDRAIL SYSTEM designed in accordance with BURIED IN BACKSLOPE(BIB) generally accepted engineering TERMINAL principles and practices,is the 2024 sole responsibility of the user REVISION DESCRIPTION DATE 07-2026 REVISED NOTES and should not be used without first consulting a Registered Professional Engineer. BoOkcio._NA__ RD436 SAR_10-ULY-2026_

FAQs

What does the document’s Table A provide for the BIB terminal?

Table A lists posted speed ranges in MPH and relates them to required slope and flare-rate conditions for the terminal installation.

Which related standard drawings are referenced for buried-in-backslope anchorage and additional guardrail details?

The sheet directs readers to Std.Dwg.RD437 for buried-in-backslope terminal anchorage parts and to the appropriate guardrail standard drawing(s) for additional details not shown.

What are the general bolting and maintenance requirements after installation?

All bolts except adjustment bolts must be drawn tight on initial installation, then rail and component bolts require a final tightness check and retightening 30 days after initial installation.

Sep 17, 2026

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