U.S.Deportment 1200 New Jersey Ave.. SE 

of Transportation Washington, D.C. 20590 

Federal Highway 

Administration 

September 29, 201 6 

In Repl y Refer To: 

HSST-l /B-262 

Ms. Karla Lechtenbcrg 

Midwest Roadside Safet y f acility 

130 Whitti er Research Center 

2200 Vine Street 

Lincoln, NE 68583 -0853 

Dear Ms. Lcchlcnberg: 

This letter is in response to your Octohcr 15. 20 15, request fo r the Federal I lighway 

Admin istration (FI-I WA) to rcvicv; a roadside safety device, bard\.\1are, or system fo r eligibility 

fo r reimbursement under the Federal-aid highway program. This FHWA letter of eligibility is 

assigned FHWA control number 13-262 and is valid until a subsequent letter is issued by FHWA 

that expressly references this device. 

Decision 

The fo llowing devices are eligible, with details provided in the form which is attached as an 

integral part of this letter: 

• Top-Mounted Weak-Post Guardrail Attached to Cul vert 

Scope of this Letter 

To be fo und eligible fo r Federal-aid fu nding. new roadside safety devices should meet the crash 

test and eva luation criteria contained in the American Association of State I lighv-.iay and 

Transportation Offic ials (AASHTO) Manual for Assessing Safety Hardware (MASH). 

However, FJ-IWA, the U.S. Department of Transportation (DOT), and the U.S. Government do 

not regulate the manufacture of roadside safety devices. Eligibility for reimbursement under the 

Federal-aid highway program does not establish approval, certification or endorsement of the 

device fo r any particular purpose or use. 

This letter is not a determination by FHWA, DOT, or the U.S. Government that a vehicle crash 

involving the device will result in any particular outcome, nor is it a guarantee of the in-service 

performance of this device. Proper manufacturing, installation, and maintenance are required in 

order for this device to function as tested. 

This finding of eligibility is limited to the crashworthiness of the system and docs not cover other 

structural features, nor conformity with the Manual on Uniform Traffic Control Devices. 

Eligibility for Reimbursement 

Based solely on a review of crash test results and certifications submitted by the manufacturer, 

and the crash test laboratory, FHW A agrees that the device described herein meets the crash test 
2 

and evaluation criteria of AASHTO MASH. Therefore, the device is eligible for reimbursement 

under the Federal-aid highway program if installed under the range of tested conditions. 

Name of system: Top-Mounted Weak-Post Guardrail Attached to Culvert 
 

Type of system: Longitudinal Barrier 
 

Test Level: MASH Test Level 3 (TL3) 
 

Testing conducted by: Midwest Roadside Safety Facility 
 

Date of request: October 15, 20 I 5 
 

Date initially acknowledged: October 20, 201 5 
 

Date of completed package: August 12, 201 6 
 

The FHWA concurs \Vith the recommendation of the accredited crash testing l(l boratory as stated 

within the attached form. 

Full Description of the Eligible Device 

The device and supporting documentation, including reports of the crash tests or other testing 

done, videos of (lny crash testing, and/or dra\.vings of the device. arc desc ri bed in the attached 

form. 

Notice 

If a manufact urer makes (lny modification to any of their roadside S(lfety hardware that has an 

existing eligibility letter from FHW A, the manufacturer must notify FHW A of such mod i (ication 

with a request fo r continued eligibility for reimbursement. The notice of all modifi cations to a 

device must be accompanied by: 

o 	 Sign ificant modifications - ror these modifications, crash test results must be 

submitted with accompanying documentation and videos. 

o 	 Non-signification modifications - For these modifications, a statement from the 

crash test laboratory on the potential effect of the modification on the ability of 

the device to meet the relevant crash test criteria. 

1 he FHWA determination of continued eligibility for the modified hardware will be based on 

whether the modified hardware wi ll continue to meet the relevant crash test criteri a. 

You are expected to supply potential users with su nicient information on design, installation and 

maintenance requirements to ensure proper performance. 

You are expected to certify to potential users that the hardware furnished has the same chemistry, 

mechanical properties, and geometry as that submitted for review, and that it will meet the 

MASH test and evaluation criteria .. 

Issuance of this letter does not convey property rights of any sort or any exclusive privilege. 

This letter is based on the premise that information and repo11s submitted by you are accurate 

and correct. We reserve the right to modify or revoke this letter if: (1) there are any inaccuracies 

in the information submitted in support of your request for this letter; (2) the qualification testing 

was fl awed; (3) in-service performance or other information reveals safety problems; (4) the 

system is significantly different from the version that was crash tested; or (5) any other 
3 

information indicates that the letter was issued in error or otherwise does not refl ect full and 

complete information about the crashwo11hiness of the system. 

Standard Provisions 

• 	 To prevent misunderstanding by others, this Jetter of eligibility designated as FHWA 

control number B-262 shall not be reproduced except in full. This letter and the test 

documentation upon whi ch it is based are public information. All such letters and 

documentation may be reviewed upon request. 

• 	 This letter shall not be construed as authori zation or consent by FHW A to use, 

manufacture, or sell any patented system for which the applicant is not the patent holder. 

• 	 If the subject device is a patented product it may be considered to be propri etary. Ir 

proprietary systems are specified by a highway agency for use on Federal-aid projects: 

(a) they must be supplied through competiti ve bidding with cqually suitablc llllpatcnt cct 

items; (b) the highway agency must certi fy that they are essenti al for synchronization 

with the existing highway fac ilities or that no equally suitable alternative exists; or (c) 

they must be used fo r research or for a disti nctive type or construction on relatively short 

sections or road for experimental purposes. Our regulations concerning proprietary 

products arc contained in Title 23 , Code of rederal Regulations, Section 635.4 11 . 

Sincerely yours, 

(

~ Directo

;;r, Offi ce IT:of ~ Safety Technologies 

Offi ce of Safety 

Enclosures 
Version 10.0 (05/16) 

Page 1 of 6 

Request for Federal Aid Rei1nbursement Eligibility 

ofHighway Safety Hardware 

'­

(I.I

....

....

.E 

.c 

:::l 

Vl 

Date of Request: August 11 , 2016 I ('New le Resubmission 

Name: Karla Lechtenberg 

Company: 

Address: 

Midwest Roadside Safety Facility 

130 Whittier Research Center, 2200 Vine Street, Lincoln, NE 68583-0853 

Country: USA 

To: Michael S. Griffith, Director 

FHWA, Office of Safety Technologies 

I request the following devices be considered eligible for reimbursement under the Federal-aid 

highway program. 

Device & Testing Criterion - Enter from right to left starting with Test Level I! - ! - ! I 

System Type Submission Type Device Name I Variant Testing Criterion 

Test 

Level 

'B': Rigid/Semi-Rigid Barriers 

(Ro<1dside, Median, Bridge 

Rai linqs) 

('Physical Crash Testing 

le Engineering Analysis 

Top-Mounted Weak-Post 

Guardrail Attached to 

Cu lvert 

AASHTOMASH TL3 

By submitting this request for review and evaluation by the Federal Highway Administration, I certify 

that the product(s) was (were) tested in conformity with th e AASHTO Manual for Assessi ng Safet y 

Hardware and that the evaluation results meet the appropriate evaluat ion criteria in the MASH. 

Individual or Organization responsible for the product: 

Contact Name: Karla Lechtenberg Same as Submitter [8J 

Company Name: Midwest Roadside Safety Facility Same as Submitter [8J 

Address: 130 Whittier Research Center, 2200 Vine Street, Lincoln, NE rnrn""'I nnr-. 

Same as Submitter [8J 

Country: USA Same as Submitter [8J 

Enter below all disclosures of financial interests as required by the FHWA 'Federal-Aid Reimbursement 

Eligibility Process for Safety Hardwa re Devices' document. 

The Midwest Roadside Safety Facility (MwRSF) and its employees are req uesting a letter of eligibility on behalf of 

the state departments of transportation participating in the Midwest States Regional Pooled Fund Program. 

MwRSF's financial interests are as follows: 

(i) No compensation, incl uding wages, salaries, commissions, professional fees, or fees for business referrals; 

(ii) Consulting relationships consist of answering design and implementation questions; 

(iii) Research funding or other forms of research support include continuing to fund research projects with 

MwRSF; 

(iv) No patents, copyrights, or other intellectual property interests for this system; 

(v) No licenses or contractual relationships for this system; and 

(vi) No business ownership and investment interests for this system. 
Version 10.0 (05/ 16) 
 

Page 2 of 6 
 
Version 10.0 (05/16) 

Page 3 of 6 

PRODUCT DESCRIPTION 

,,.... New Hardware or r.:- Modification to N s· .f. t 

\ Significant Modification \• Existing Hardware on- igrn ican 

The Top-Mounted Weak-Post Guardrail Attached to Culvert (SGR52) is an adaptation of the weak-post MGS 

bridge rail that allows for attachment to the outside face of culvert headwalls. It utilizes 44-in. long S3x5.7 steel 

posts with standoffs (PSFOl) spaced at half-post spacing, or 37Vi in. on center, and mounted in steel topmounted bracket assemblies. The top-mounted bracket assemblies consists of a top mounting plate, a gusset, 

a tube socket, and a bottom mounting plate welded together. The top mounting plate is a 1/2 in. thick, 3 in. 

wide, and 9 1/2 in. long ASTM A572 Grade 50 steel plate. The gusset is a 1/2 in. thick, 1 1/2 in. wide, and 2 in. 

long ASTM A572 Grade 50 steel plate.The tube socket is a 16 1/2-in. long, 4-in. x 4-in. x 3/8-in. square ASTM 

A500 steel tube. The bottom mounting plate is a 1/2 in. thick, 3 in wide, and 8 in. long ASTM A572 Grade 50 

steel plate with two 5/8-in. wide slots cut into the plate. The top-mounted bracket assemblies are anchored to 

the culvert with a 13-in. long, 1 1/8-in. diameter ASTM A307 Grade C threaded rod (FRR28a) that passes 

through the upper strap of the socket and is embedded 10 inches into the top of the culvert headwall using an 

epoxy with a minimum bond strength of 1,300 psi and secured with a washer (FWC30a) and nut (FNX28a). Two 

7-in. long, 1/2-in. diameter ASTM A307 Grade C threaded rods (FRRl 2a), one on each side of the socket tube, 

are used to attach the bottom mounting plate to the outside face of the headwall. The 1/2-in. threaded rods 

(FRRl 2a) are embedded 4 1/2 inches into the headwall using an epoxy with a minimum bond strength of 1,300 

psi and are secured on the outside by a washer (FWC12a) and a nut (FNXl 2a). The center of the threaded rods 

(FRR28a and FRR l 2a) should be placed a minimum of 4 inches from the free end of a culvert headwnll. A 5-in. 

long, S/s-in. diameter ASTM A325 Type 1 hex bolt (Fl3X16a) was passed through the web of the post and both 

sides of the socket. The rail cons ists of standard 12-gauge W-beam sections (RWM04a) installed with the top of 

the rail set at a nominal height of 31 inches. A 12-in. long, 12-gauge backup plate (RWB01 a) is used to block the 

rail away from the front face of the steel post. The rail splices are located at posts. The rail is attached to the 

posts with 1 1/4-in. long, 5116-in. diameter ASTM A307 Grade A bolts and nuts (FBX08a) and a P/.1-in. x P/.1-in. x 

1/s-in. square washer (FWROl) positioned between th e bolt head and the traffic-side face of the rail. The culvert 

should have a minimum 28-day compressive strength of 4,000 psi. 

A stiffness transition between the Top-Mounted Weak-Post Guardrail Attached to Cu lvert and adjacent 

standard MGS installations is not necessary. A 75-in. spacing is recommended between the last weak-post on 

the culvert and the first standard guardrail post of the adjacent MGS installation which can be either blocked or 

non-blocked MGS. The first standard guardrai l post adjacent to the culvert should be placed a minimum of 12 

inches from the culvert and any wingwalls. Guardrail terminals (or end anchorages) should be located a 

sufficient distance from the culvert to prevent the two systems from interfering with the proper performance 

of one another. Therefore, the following implementation guidelines should be considered in addition to 

guardrail length of need requirements: 

(1) A minimum length of 12 ft - 6 in. of standard MGS is recommended between the first weak post and the 

interior end of an acceptable TL-3 guardrail end terminal. 

(2) A minimum barrier length of 50 ft is recommended before the first weak post, which includes standard MGS 

and a crashworthy guardrail end terminal. This guidance applies to the downstream end as well. 

(3) For flared guardrail applications, a minimum length of 25 ft is recom mended between the first weak post 

and the start of the flared section (i.e., bend between flared and tangent sections). 

CRASH TESTING 

By signature below, the Engineer affiliated with the testing laboratory, agrees in support of this submission that 

the Modification to Existing Hardware is deemed Non-significant for the device listed above to meet the MASH 

criteria. 

Engineer Name: Scott Rosenbaugh 

h D191tally stgncd by Scott Roscnbiugh 

ONocn• S<ottR01•nbaugh.o•MwRSF.ou. Engineer Signature: Scott RosenbaUg cma11•srosenbaugh20 unl.edu. C• US

Date :2016.08.12 07:48:18 ·05'00' 

Address: 130 Whittier Research Center, 2200 Vine Street, Same as Submitter cgi ... ,,... ,,.nr-n.,, -­-.,, 

Country: tt::-t<;:,<-tt-,­ '-·-- ------­---­----1Same as Submitter cgi 
Version 10.0 (05/16) 

Page 4 of 6 

A brief description of each crash test and it s result: 

Required Test Narrative Eva luation 

Number Description Results 

The Top-Mounted Weak-Post Guardrail 

Attached to Culvert is an adaptation ofthe 

weak-post Midwest Guardrail System (MGS) 

bridge rail that allows for attachment to the 

outside face of culvert headwalls. If the new 

components (which are the attachment and 

anchorage hardware utilized to mount the 

socket flush with the outside face ofthe 

culvert headwall) are shown to withstand 

extreme loading conditions without 

damage to the socket assembly or the 

culvert headwall, the Top-Mounted WeakPost Guardrai l attached to Culvert would 

perform similarly to the original weak-post 

MGS bridge rail. The original wea k-post 

MGS bridge rail has been tested, satisfies 

the MASH TL-3 testi ng criteria, and has an 

FHWA Eligibility Letter (B-228). The results 

of full-scale crash testing conducted on the 

original weak-post MGS bridge rail can be 

found in MwRSF report no. TRP-03-226-10. 

Dynamic component testing consisted of a 
 

longitudinal impact (0-degree impact angle) 
 

on the post at a height of 12 in., resulting in 
 

3-1 0 ( 11 OOC) weak-axis bending. This is believed to be a Modification has no effect on crashworth iness 

critical loading condition that represents a 
 

small car bumper impacting posts during a 
 

redirection and induces high shear loads 
 

into the socket and may cause the socket to 
 

rotate. 
 

The results of test no. CP-7 A (longitudinal 
 

impact) conducted on August 2, 2012 are 
 

found in MwRSF report no. TRP-03-277-14. 
 

A 1,816-lb rigid-frame bogie vehicle 
 

impacted the post at a speed of 21.3 mph 
 

and at an angle of 0 degrees. Immediately 
 

upon impact, the top ofthe socket shifted 
 

downward 1 /4 in. due to construction 
 

tolerances and the distance between the 
 

socket and the top anchor. A plastic hinge 
 

formed in the post adjacent to the top-


downstream edge of the socket as the post 
 

bent over. The bogie overrode the post at 
 

0.09 seconds after impact. The socket and 
 

attachment hardware were intact and did 
 

not encounter plastic deformations. The 
 

epoxied anchors showed no signs of 
 

slippage or pullout. The culvert headwall 
 

was free of concrete cracking and spalling. 
 
Version 10.0 (05/16) 

Page 5 of 6 

Required Test 

Number 

3-1 1 (2270P) 

3-20 (1 lOOC) 

3-21 (2270P) 

Narrative 

Description 

The Top-Mounted Weak-Post Guardrail 

Attached to Culvert is an adaptation of the 

weak-post Midwest Guardrail System (MGS) 

bridge rai l that allows for attachment to the 

outside fa ce of culvert headwalls. If the new 

components (which are the attachment and 

anchorage hard ware utilized to mount the 

socket flush with the outside face of the 

culvert headwall) are shown to withstand 

extreme loading conditions without 

damage to the socket assembly or the 

culvert headwall, the Top-Mounted WeakPost Guardrail attached to Culvert would 

perform similarly to the original weak-post 

MGS bridge rail. The original weak-post 

MGS bridge rail has been tested, satisfies 

the MASH TL-3 testing criteria, and has an 

FHWA Eligibility Letter (B-228). The results 

of full-scale crash testing conducted on the 

original weak-post MGS bridge rail can be 

found in MwHSF report no:TRP-03-226-10. 

Dyna mic componen t testing consisted of a 

lateral impact (90-degree impact angle) on 

the post at a height of 24 7 /8 in., resulting in 

strong-axis bending. This is believed to be a 

critical loading condition which matches 

the height to the center of the W-beam rail 

and represents maximum lateral loading 

into the guardrail system. 

The results of test no. CP-2A (lateral impact) 

conducted on Ju ne 27, 2012 are found in 

MwRSF report no. THP-03-277-14. A 1,775-lb 

rigid-frame bogie vehicle impacted the post 

at a speed of 22.3 mph and at an angle of 90 

degrees. Immediately upon impact, the top 

ofthe socket shifted backward 1 /8 in. due 

to construction tolerances in the topmounting plate hole. A plastic hinge formed 

in the post adjacent to the top-back edge of 

the socket as the post bent over. The bogie 

overrode the post at 0.084 seconds after 

impact. The socket and attachment 

hardware were intact and did not encounter 

plastic deformations. The epoxied anchors 

showed no signs of slippage or pullout. The 

culvert headwall was free of concrete 

cracking and spalling. 

Test no. 3-20 is not applicable for this type 

of system. 

Test no. 3-31 is not applicable for this type 

of system . 

Evaluation 

Results 

Modification has no effect on crashworthiness 

Non-Relevant Test, not conducted 

Non-Relevant Test, not conducted 
. . Karla 0.?U,1t'9'A°'dbtll.1<l•l~~.&«.b..•9 

S f1'l Cf\ ._otl'l4lf'<h!.......W'•0 o 

u b m1tter Signature*: L h b '-'.d,.~ l 

~\411~ f'lfl .te1• 1~ i.· ...

ec ten erg 11~1go,.

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Submit Form 

Version 10.0 (05/16) 

Page 6 of 6 

Testing Laboratory's signature concurs that these modifications are considered Non-Significant. 

Laboratory Name: Midwest Roadside Safety Facility 

Laboratory Signature: Karla Lechten berg O.git.tlly signed by Kalld leduenberg 

ON· en K.1rl.:t ll:ch1enbc19. o-M1dwc\t Ro:tdside S.lfely r~c1l1ty tMwRSO. 

ou. email - kpohvka1Jiunl edu, c US 

od1e-2016os 1i100912 os·oo· 

Address: 130 Whittier Research Center, 2200 Vine Street, 

Lincoln, NE 68583-0853 Same as Submitter 1:8] 

Country: USA Same as Submitter 1:8] 

Accred itation Certificate 

Number and Dates of current 

Accreditation period : 

A2LA Certificate Number: 2937.01, Valid to November 30, 2017 

ATTACHMENTS 

/\ tlach to th is form: 
 

I) Additional disc losures of related fi nancial interest as indicated above. 
 

2) A copy of the full test report, video, and a Test Data Summary Sheet for each test conducted in 
 

support of this request. 

3) /\.drawing or drawings of the device(s) that conform to the Task Force-13 Drawing Specifications 

[Hard\\ are Guide Drawing Standards]. For proprietary products. a single isometric line drawing is 

usually acceptable to illustrate the product. with detailed specificati ons, intended use. and contact 

in formation provided on the reverse. Add itional drawings (not in TP- 13 format) showing details that 

are relevant to understanding the dimensions and performance of the device should also be submitted 

to fac ilitate our review. 

FHWA Official Business Only: 

Eligibility Letter 

Number Date Key Words 
{

I ,, ,, I 

I 1 

' v 

PLAN VIEW 

.J7 1/2"[9S.J) 150"[ 3810 ] (TYP) 

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: I I I I I I i I I I I I I I 
 

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i-L -· - - - - - --- - --- - - - -1--- - - - _ .J_ - _L __ - - ----- - ---- - - - - ----- _ ...L-.-J_ - - - ··-- - - ---- --- - ---l 

i ~ ELEVATION VILW J 

FWR01 

8-l l::ll::l01 ~WR01 

RWMQLo 

FBX08o 

DETAIL A DETAIL B 

TOP-MOUNTED WEAK-POST GUARDRAIL ATTACHED TO CULVERT 
 

SGR52 4~' -~ ,.~, SHEET NO. DATE: 

I of7 5/28/2015
INTENDED USE 
 

The Top-Mounted Weak-Post Guardrail Attached to Cu lvert is designed as a treatment to continue W-beam guardrail 

systems across large box culverts. It is compatible with the Midwest Guard rail System (MGS) with or without 

blackouts (SGR20a-c or SGR4 I) such that an approach transition would not be required between the two barriers. 

The Top-Mounted Weak-Post Guardrail Attached to Culvert is an adaptation of the MGS Bridge Rail (SB002c) with 

only the socket length and attachment hardware changing. AII post and rail components are identical to the original 

MGS Bridge Rail (SB002c). The Top-Mounted Weak-Post Guardrail Attached to Culvert is TL-3 accepted, and is 

accepted according to the Manual for Assessing Safety Hardware (MASH) safety performance criteria. 

The Top-Mounted Weak-Post Guardrail Attached to Culvert is one of two configurations for the Weak-Post 

Guardrail Attached to Culvert. The other configuration is a Side-Mounted Weak-Post Guardrail Attached to Culvert 

(SGR53). 

A stiffness transition between the new guardrail attached to culvert system and adjacent MGS instal lation (SGR20a-c 

or SGR4 I) is unnecessary. A 75-in . [I 905) spacing is recommended between the last S3x5. 7 (S76x8.5) culvert post 

(PSFO I) and the first guardrail post of the adjacent MGS installation. The adjacent MGS may be either blocked or 

non-blocked (SG R20a-c or SG R4 I). 

COMPONENTS 
 

Unit Length = 150'' 138 1 Ol 
 

DESIGNATOR COi\IPONENT Nlii\IBEI{ 
 

PSFO I S3x5.7 by 44" long Post and Standoff 4 
 

RWM04a 12'-6.. W-Beam MGS Section 1/2 Post Spacing I 
 

RWl30 Ia 12" W-13eam Backup Plate 4 
 

r:BX08a I lex Bolt 5/16"- 18xl 1/4"xl 1/4'' and Nut 4 
 

f-WRO I I 3/4"x I 3/4"x 1/8'' Square Guardrail Washer 4 
 

FBBOI 5/8" Dia., I I /2" Long Guardrai I Bolt and Nut 8 
 

FRX 16a Hex Bolt 5/8"-11 x5"x I I /4" and Nut 4 

Top-Mounted Bracket Assembly 4 

FWC30a I 1/8" Plain Round Washer 4 

l-WC l2a I /2" Plain Round Washer 8 

l'RR28 I I /8" Dia., 13" Long Threaded Rod 4 

FNX28a I I /8" Dia. Hex Nut 4 

FRRl2b 1/2" Dia., 7" Long Threaded Rod 8 

f-NX 12a I/2" Dia. Hex Nut 8 

ELIGIBILITY 

FHWA Eligibility is being pursued 

TOP-MOUNTED WEAK-POST GUARDRAIL ATTACHED TO CUL VERT 

4-"' . ',,..,..._,, 

SGR52 

SHEET NO. DATE: 

2 of7 5/28/20t 5 
l-WR01 

8-F8801 

FBX08o 

RWHO l o 

I RR/8 l-WC30o 

FNX28o 
 

H-!X16o 
 

I 
 

I 
 

I 
 

I 
 

I 
 

I 
 

I TOP-MOdNl FO I HR/\CK[l ASS[MHl Y I 
 

I 
 

I 
 

I 
 

I 
 

I 
 

I I 
 l_ J 
 

c-_:::::::::. 

SECTION C- C 

TOP-MOUNTED WEAK-POST GUARDRAIL ATTACHED TO CULVERT 
 

SGR52 

4 ,,t ' -~ I • ...-:- .I' SHEET NO. DATE: 

3 of 7 
 5/28/20 15 
 
REFERENCES 

Schneider, A.J., Rosenbaugh, S.K., railer, R.K. , Sicking, D.L., Lechtenberg, K.A., and Reid, J.D. , Safety 

Pe1for111ance Evaluation o,[Weak-Post, W-Beam Guardrail Attached to Culvert, Fi nal Report to the Midwest States 

Pooled Fund Program, MwRSF Research Report No. TRP-03-277- 14, Midwest Roadside Safety Faci li ty, University 

of Nebraska-Lincoln, Lincoln, Nebraska, February 12, 2014. 

Rosenbaugh, S.K., Faller, R.K. , Lechtenberg, K.A. , and Bielenberg. R.W ., Weak-Post, W-Beam Guardrail 

At1ach111ent to Culvert Headwalls, Paper No. 14-3930, Transportation Research Record No. 2437, Journal of the 

Transportation Research Board, TRB Ar:'B20 Committee on Roadside Safety Design, Transportation Research 

Board, Wash ington D.C., January 20 14, pages 41-5 1. 

CONTACT INFORMATION 

Midwest Roadside Safely r:'aci lity 

University of Nebraska-Lincoln 

130 Whitt ier Research Cente r 

2200 Vine Street 

Lincoln. NF: 68583-0853 

(402) 472-0965 

Email: 111 wrsf@ unl.edu 

Website: htt p://111 wrsf. un 1. edu/ 

TOP-MOUNTED WEAK-POST GUARDRAIL ATTACHED TO CULVERT 

SGR52 4~' -~ ' •~I SHEET NO. DATE: 

4 of7 5/28/20 15 
3/8" (1 0] E70xx 

1/7"( 13) 

PLAN Vll::_W 

..5/8" ( 1 OJ 

L /Oxx 

MO UN I ING Pl/\ I~ GUSSL l 

1UHI 

3/8" [ 1 O] 

..5/8" [ 10] 

ELEVATION VIEW 

lOP MOUNTING Pl /\lE 

f70xx 

3/8" [10] 

F70xx 

f /Oxx 

BOlTOM MOUNl ING 

TOP- MOUNTED BRACKET ASSEMBLY 

!SOME I RIC VILVJ 

/ "( 51 ] 

PROFILE VIEW 

TOP-MOUNTED WEAK-POST GUARDRAIL ATTACHED TO CULVERT 

SGR52 

SHEET NO. DATE: 

5 of7 512812015 
7 

t--2"[ 51 ] 

i /2"[ 1.5 J-+--J 

1/2"(13)1--LJ 1 1/2"(38) 

.5/4"[ 19 ] D THRU 7"[ 51 ]r _L_ t t /7"[13] td31

ELEVATION VIEW 

1/2" [ 13] THICK TOP MOUNTING PLATE GUSSET 

- --8"[70.5]--­

- --l'll /8 ]- ---< 

'1/8"[ 16] IJ 1"[ 7~J ] \TYP) 

1 

16 1/7"[419] 

1 

1/2"[ 64 ] 

·+ 

I -~ "( /G J 

1 1/2"(.58 ] 

ELEVATION VIEW 
 

1/2" [ 13] THICK BOTTOM MOU NTING PLATE 
 

r-91/7"[741 ]1 

ELEVATION VIEW 1 

3"[ 76 ] 

~------+---t--~ 1 1/2"(.58) I 

1 1/4"[37 ] 

4"x4"x3/8" [102x102x10] TUBE 

7"[51]L 

ELEVATION VIEW 

1/2" [ 13] THICK TOP MOUNTING PLATE 

TOP-MOUNTED WEAK-POST GUARDRAIL ATTACHED TO CUL VERT 
 

SGR52 
 

Sl-I EETNO. DATE: 

6 of7 5/28/20 15 
SPECIFICATIONS 

4"x4" Square Tube 

The square tube shall be ASTM A500 grade B galvan ized steel. 

Top Mounting Plate 

The top mounting plate shall be ASTM A572 grade 50 galvanized steel. 

Top Mounting Plate Gusset 

The top mounting plate gusset shall be ASTM A572 grade 50 galvanized steel. 

Bottom Mounting Plate 

The bottom mounting plate sha ll be ASTM A572 grade 50 galvan ized steel. 

TOP-MOUNTED WEAK-POST GUARDRAIL ATTACHED TO CULVERT 

SGR52 

4 ' -~ I • I SHEET NO. DATE: 

7 of7 5128/2015