1200 New Jersey Ave., SE 

Washington, D.C. 20590 

December 18, 2015 

In Reply Refer To: 

HSST/B-243A 

Ms. Karla Lechtenberg 

Midwest Roadside Safety Facility 

130 Whittier Research Center 

2200 Vine Street 

Lincoln, NE 68583-0853 

Dear Ms. Lechtenberg: 

This letter is in response to your March 6, 2015 request for the Federal Highway Administration 

(FHWA) to review a roadside safety device, hardware, or system for eligibility for 

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

assigned FHWA control number B-243A and is valid until a subsequent letter is issued by 

FHWA that expressly references this device. 

Decision 

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

integral part of this letter: 

• Non-Blocked Steel-Post MGS for Use on Wire-Faced, MSE Walls 

Scope of this Letter 

To be found eligible for Federal-aid funding, new roadside safety devices should meet the crash 

test and evaluation criteria contained in the American Association of State Highway and 

Transportation Officials’ (AASHTO) Manual for Assessing Safety Hardware (MASH). 

However, the FHWA, the Department of Transportation, and the United States 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 for any particular purpose or use. 

This letter is not a determination by the FHWA, the Department of Transportation, or the United 

States 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 does not cover other 

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

 

2 

Eligibility for Reimbursement 

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

and the crash test laboratory, FHWA agrees that the device described herein meets the crash test 

and evaluation criteria of the American Association of State Highway and Transportation 

Officials’ Manual for Assessing Safety Hardware (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: Non-Blocked Steel-Post MGS for Use on Wire-Faced, MSE Walls 

Type of system: Longitudinal Barrier 

Test Level: MASH Test Level 3 

Testing conducted by: Midwest Roadside Safety Facility 

Task Force 13 Designator: SGR39 

Date of request: March 6, 2015 

Date initially acknowledged: March 23, 2015 

Date of completed package: August 21, 2015 

Full Description of the Eligible Device 

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

done, videos of any crash testing, and/or drawings of the device, are described in the attached 

form. 

Notice 

If a manufacturer makes any modification to any of their roadside safety hardware that has an 

existing eligibility letter from FHWA, the manufacturer must notify FHWA of such modification 

with a request for continued eligibility for reimbursement. The notice of all modifications to a 

device must be accompanied by: 

o	 Significant modifications – For 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. 

FHWA's determination of continued eligibility for the modified hardware will be based on 

whether the modified hardware will continue to meet the relevant crash test criteria. 

You are expected to supply potential users with sufficient 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 test 

and evaluation criteria of the MASH. 
3 

Issuance of this letter does not convey property ri ghts of any so11 or any exclusive privilege. This 

Jetter is based on the premise that information and reports submitted by you are accurate and 

corTect. We reserve the right to modify or revoke this Jetter if: (1) there are any inaccuracies in 

the information submitted in support of your request for this letter, (2) the qualifi cation testing 

was flawed , (3) in-service perfo1111ance or other information reveals safety problems, (4) the 

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

information indicates that the letter was issued in eITor or otherwise does not re fl ect fu ll and 

complete in formation about the crashworthiness of the system. 

Standard Provisions 

• 	 This letter provides a AASHTO/ARTBAIAGC Task Force 13 designator that should be 

used for the purpose ofthe c reation of a new and/or the update of an existing Task Force 

13 drawing for posting on the on-line 'Guide to Standardized Highway Barrier Hardware' 

currentl y referenced in AASHTO Roadside Design Guide. 

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

control number B-243A sha ll not be reproduced except in fo l I. This letter and the test 

documentation upon which it is based arc public information. All such lellers and 

documentation may be reviewed upon request. 

• 	 This letter shall not be construed as authorization or consent by the FHWA to use, 

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

• 	 Ifthe subj ect device is a patented product it may be considered to be proprietary. If 

proprietary systems are specified by a hi ghway agency for use on Federa l-aid projects: 

(a) they must be supplied through competitive bidding with equally suitable unpatented 

items; (b) the highway agency must certify that they are essential for synchronization 

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

they must be used for research or for a distincti ve type of construction on re latively short 

sections ofroad for experimental purposes. Our regulations concerning proprietary 

products are contained in Title 23, Code of Federal Regulations, Section 635.4 11. 

Sincerely yours, 

~)Michael S. Griflith ~ 

Director, Office of Safety Technologies 

Office of Safety 

Enclosures 
Version 8.0 (08/14) 

Page 1 of 4 

Request for Federal Aid Reimbursement Eligibility 

OfHighway Safety Hardware 

Date of Request: February 19, 2015 I Ci' New r Resubmission

Name: Karla Lechtenberg 

... 

!! ·e 

.a 

:::s 

en 

Company: Midwest Roadside Safety Facility

Address: 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. 

IHelp 

System Type Submission Type Device Name I Variant Testing Criterion Test 

Level 

'B': Barriers (Roadside, (i Physical Crash Testing Non-Blocked Steel-Post 

AASHTOMASH TL3 

Median, Bridge Railings) (' FEA & V&V Analysis MGS for Use on Wire-

(' Engineering Analysis Faced, MSE Walls 

I 

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 the AASHTO Manual for Assessing Safety 

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

Identification of the individual or organization responsible for the product: 

Contact Name: Karla Lechtenberg Same as Submitter [81 

Company Name: Midwest Roadside Safety Facility Same as Submitter [81 

Address: 130 Whittier Research Center, 2200 Vine Street, Lincoln, NE 68583­ Same as Submitter [81 

Country: USA Same as Submitter [81 
Version 8.0 (08/14) 

Page 2 of 4 

PRODUCT DESCRIPTION 

Ci New Hardware r Modification to 

Existing Hardware I 

The non-blocked Midwest Guardrail System (MGS) for use on wire-faced, MSE walls (SGR39) consists ofstandard 

12-gauge W-beam sections (RWM04a) installed with the top ofthe rail set at a nominal height of 31 inches. The 

rail is mounted on standard W6x8.5 (or W6x9) ASTM A992 or A36 steel posts that are 6-ft long (PWE06) and set 

at 75-in. centers. The posts are embedded 40 inches in the wire-faced, MSE wall. The posts are placed at the 

slope break point ofthe 3H:l V fill slope located on the wire-faced, MSE wall. A 12-in. long, 12-gauge backup 

plate (RWBOl a) is used to block the rail away from the front face of the steel post. The rail splices are located at 

mid-spans between adjacent posts. Standard splice bolts or ASTM A307 5/8-in. diameter x 1 Y2-in. long guardrail 

bolts and nuts (FBBOl) are used to attach the rail to the posts. The wire-faced, MSE wall system consisted of 

three 2-ft thick layers of roller-compacted, course, crushed limestone material with a 3H:1 V fill slope at the outer 

edge for the as-built test installation. Other wire-faced, MSE wall configurations may be used, however, three 

layers is the minimum and the soil-aggregate material shall be the same. The soil-aggregate material shall meet 

the select wall backfill materials denoted in Sections 255 and 704 of the 2003 FHWA Standard Specifications for 

Construction of Roads and Bridges on Federal Highway Projects, which also closely conforms to the Grading B 

specifications of AASHTO M147-65 denoted in MASH and NCHRP Report No. 350. The outer region ofthe 

bottom two layers shall contain a wall facing fill material that consists of4 to 6-in. diameter rocks that shall be 

placed by hand. Steel-wire reinforcement mats are used to construct and stabilize the MSE wall system. 

For non-blocked steel-post MGS systems, the back side of steel posts are recommended to be placed a 

minimum of 1 ft away from the inside edge of the wall facing fill or 4 ft away from the outer edge of the MSE 

wall which utilize a 3H:1 V fill slope, whichever results in the largest lateral offset between the post and exterior 

wall face. For this recommendation, the minimum lateral offset between the rail face and outer edge of the MSE 

wall would be 4 ft- 9% in. The recommended guidance regarding the minimum lateral offset for the steel posts 

for varying thickness of select wall backfill and different widths for the 3H:1 V fill slope are shown in Figures ES-1 

through ES-3. 

CRASH TESTING 

A brief description of each crash test and its result: 

Required Test 

Number 

Narrative 

Description Evaluation Results 

3-10 (llOOC) 

The results of test no. MGSGW-1 conducted on October 20, 2009 

are found in MwRSF report no. TRP-03-235-11. A 2,596-lb small car 

with a simulated occupant in the right-front seat, impacted the 

non-blocked steel-post MGS system placed at the slope break point 

ofa 3H:1V fill slope on top of a wire-faced, MSE wall at a speed of 

61.0 mph and at an angle of 25.3 degrees. At 0.726 sec, the vehicle 

exited the system at a speed of 10.2 mph and at an angle of 58.3 

degrees as it spun-out. 

Exterior vehicle damage was moderate, and the interior occupant 

compartment deformations were minimal with a maximum of 1 % 

in., consequently not violating the limits established in MASH. 

Damage to the barrier was also moderate, consisting of contact 

marks on and deformation to the W-beam rail and the guardrail 

posts. The maximum lateral dynamic rail and post deflections were 

27.4 in. and 26.2 in., respectively. The working width of the system 

was 35.7 in. All occupant risk measures were within the 

recommended limits, and the test vehicle showed no tendency for 

rollover. 

PASS 
Version 8.0 (08/14) 

Page 3 of 4 

Required Test 

Number 

Narrative 

Description Evaluation Results 

The results of test no. MGSGW-2 conducted on November 20, 2009 

are found in MwRSF report no. TRP-03-235-11. A 5,169-lb pickup 

truck with a simulated occupant seated in the right-front seat, 

impacted the non-blocked steel-post MGS system placed at the 

slope break point ofa 3H: 1 V fill slope on top ofa wire-faced, MSE 

wall at a speed of 65.3 mph and at an angle of 25.1 degrees. At 

0.230 sec after impact, the vehicle became parallel with the system 

at a speed of46.7 mph. At 0.4S2 sec, the vehicle exited the system 

at a speed of43.8 mph and at an angle of 20.4 degrees. 

3- 11 (2270P) 

Exterior vehicle damage was moderate, and the interior occupant 

compartment deformations were minimal with a maximum of 1 1/2 

in., consequently not violating the limits established in MASH. 

Damage to the barrier was also moderate, consisting of contact 

marks on and deformation to the W-beam rail and the guardrail 

posts. The maximum lateral dynamic rail and post deflections were 

both 35.7 in. The working width of the system was 45.2 in. All 

occupant risk measures were within recommended limits, and the 

test vehicle showed no tendency for rollover. 

PASS 

3-20 (1100() Not Applicable WAIVER REQUESTED 

3-21 (2270P) Nol Applicable WAIVER REQUESTED 

Full Scale Crash Testing was done in compliance with MASH by the following accredited crash test 

laboratory (cite the laboratory's accreditation status as noted in the crash test reports.): 

Laboratory Name: Midwest Roadside Safety Facility 

Laboratory Contact: Karla Lechtenberg Sarne as Submitter r:8J 

Address: 130 Whittier Research Center, 2200 Vine Street, 

Lincoln, NE 68583-0853 Same as Submitter r:8J 

Country: USA Same as Submitter r:8J 

Accreditation Certificate 

Number and Date: 

A2LA Certificate Number: 2937.01, Valid to November 30, 2015 

......... . s· 0..-...,...,.....llt Karla ~ 

S u b m1tter 1gnature:L ht b .... .,.. ,~.. ..........
 ........."'"""",.. 

ec en erg a,..~.1-

-..~..., "'1\ 

c-... Ut!llt·•rn <1.:.. 

Submit Form 

ATTACHMENTS 

Attach to this form: 

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

support of this request. 

2) A drawing or drawings of the dcvicc(s) that conform to the Task Force-13 Drawing Spccilications 

11 lnrdwarc Guide Drnwio~ Srnndards). For proprietary products, a sing le isometric line drawing is 

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

information provided on the reverse. Additional drawings (not in TF-13 format) showing details that 

arc key to understanding the performance of the device should also be submitled to facilitate our 

review. 
Version 8.0 (08/14) 

Page 4 of 4 

FHWA Official Business Only: 

Eligibility Letter 

Number Date 

AASHTOTF13 

Designator Key Words 
NeliaSKa 


MIDWEST ROADSIDE SAFETY FACILITY 

December 1 1, 2015 

Subject: Not Applicable Tests 

Dear Will: 

This letter is intended to further clarify the Not Applicable statement in the Narrative 

Description for Required Test Number 3-20 and 3-21 in the Request for Federal Aid 

Reimbursement Eligibility of Highway Safety Hardware form submitted for NonBlocked Steel-Post MGS for Use on Wire-Faced, MSE Walls for which we are 

requesting a letter of eligibility on behalf of the state departments of transportation 

participating in the Midwest States Regional Pooled Fund Program, specifically 

Wisconsin Department of Transportation. 

Test numbers 3-20 and 3-21 are not applicable for this type of system. 

If you need any further information or clarification, please feel free to contact Dr. Ron 

Faller or myself. 

Sincerely, 

-!fa.. tJ ;t~t Karla A. Lechtenberg 

Research Associate Engineer 

cc: Ronald K. Faller, Ph.D., Director and Research Associate Professor 

130 Whittier Research Center I P.O. Box 830853 I Lincoln, NE 68583-0853 I mwrsf.unl.edu 
MIDWEST ROADSIDE SAFETY FACILITY 

August 27, 2015 

Subject: Financial Interest Statement 

Dear Will: 

This letter is intended to be a disclosure of any financial interest that the Midwest 

Roadside Safety Facility (MwRSF) and its employees have in the Non-Blocked SteelPost MGS for Use on Wire-Faced, MSE Walls for which we are requesting a letter of 

eligibility on behalf of the Federal Highway Administration, Central Federal Lands 

Highway Division. 

MwRSF's financial interests are as follows: 

(i) No compensation, including 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 funding individual 

research 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. 

If you need any further information or clarification, please feel free to contact Dr. Ron 

Faller or myself. 

Sincerely, 

jfa... {i c¥'~t Karla A. Lechtenberg 

Research Associate Engineer 

cc: Ronald K. Faller, Ph.D., Director and Research Associate Professor 

130 Whittier Research Center I P.O. Box 830853 I Lincoln, NE 68583-0853 I mwrsf.unl.edu 
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Figure 71. Schematic. Test Results and Sequential Photographs, Test No. MGSGW-2. 
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SCOPE OF ACCREDITATION TO ISO/IEC 17025:2005 

MIDWEST ROADSIDE SAFETY f ACILITY (MwRSF)

1 


University of Nebraska-Lincoln 


4800 NW 351

" Street 


Lincoln. NE 68524 


Ms. Karla Lech1enbcrg Phone: 402 472 9070 


MEC I IANI CAL 

Valid To: December 31 . 20 15 	 Cerli licnlc Number: 2937.0 1 

In recogni1ion of the successful completion of the A2LA evaluation process, accredi1ation is granted 10 1his 

labora1ory to perfonn the following tests: 

Test Mcthocls

2 

Full-Scale Vehicle Crash Tests of Ilighway Safety NCHRP Report 350: MASI I; EN 1317 

Features 

Full-Scale Vehicle Crash Tests of Perimeter ASTM F2656; SD-STD-02.01 Revision A 

Protec1ion Systems and Access Control Devices 

Bogie and Pendulum Dynamic Tests of Highway Non-Standard Test Method: Dynamic Testing of 

Safety Pea1ures 	 Steel Post and Rigid Foundation: Non-Standard Test 

Method: Dynamic Testing of Post in Soil; 

Non-Siandard Test Method: Dynamic Testing of 

Spacer Blocks 

Crushable Nose Pendulum/Bogie Testing for Non-Standard Test Method: Dynamic Testing of 

13reakaway Supports Breakaway Supports: AASHTO Breakaway 

Poles and Supports; NCH RP Rcpon 350 

On the following tvpes of products, materials. and/or structures: Metal, Wood, Concrete and Plastic Structures, 

Components of S1ructures, f asteners, and Roadway Pavements. 

1 Administrative office located at: 2200 Vine Street, 130 Whittier Building. Lincoln. NE 68583-0853. 

2 This laboratory meets A2LA RI 04 - General Req11ireme111s: Accrediwtio11 ofField Testing and Field 

Calibratio11 laboratories for these tests. 

(A2LA Cert. No. 2937.01 ) Revised 11 /25/201 5 

5202 Presidents Court. Suite 220 I Frederick. MD 21703-8398 I Phone: 30I 644 3248 Fox: 240 454 9449 www.A2LA.o g 
Accredited Laboratory 


A2LA has accredited 

MIDWEST ROADSIDE SAFETY FACILITY (MWRSF) 


Lincoln, NE 

for technical competence in the field of 

Mechanical Testing 

This laboratory is accredited in accordance with the recognized International Standard ISO/IEC 17025:2005 


General requirements for the competence of testing and calibration laboratories. This accreditation demonstrates 


technical competence for a defined scope and the operation of a laboratory quality management system 


(refer to joint JSO-ILAC-IAF Communique dated 8 January 2009). 


Presented this 3 1 s1 day of December 2013. 

For the tests to which this accredita tion applies, please refer to the laboratory's Mechanical Scope of Accreditation. 
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SECTION A-A 

Dt.AIL 8 


ASH TL-3 NO 1-0LOCKED GS ADJACE 'T TO A 3H: IV SLOPE ON TOP OF A WIRE-FACED. MSE WALL 

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SGR39 

SHEET NO. DATE: 

I of4 917/20 t I 

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1:\T E\Dt:D r sE 

1\ non-blocl.cd :-.li1h\Cst Guardrail S~ tem (MGS) \1 ith st.indard po~t ~pac can be placed on top of and fo rnard from a 

\\ire-faced. mechanically stabili1cd canh (l\I SE) \\all S)stcm and used 111l ocations 1\hcrc a ma\imum dynanuc dcfkc11011 

of27..1 " (6961 or less is acceptable and ''here n \1 orking \1idth of 35.7'" [907] is pro,ided. The non-blocl..cd l\IGS should 

be anchor.:d and terminated using a suitable guardrail end tn.:atm.:nt that is appro' cd ''ith a 3 1" [787 ( nonunnl top 

mountmg height. The non-blocked l\IGS should be used \\Ith '''de-llangc steel posts (P\\'E06) The non-blocl.cd MGS 

adJ ncent to a 3: I fill slope on "irc-fuced, MSE \\all S) stem has been crash tested under TL-3 using test dcsignmions nos 

3-10 and J-1 1 and \\as fou nd acccprnblc ;iccording to the Munual for Assessing Safety Hard\\!ln: (MASI I) performance 

criteria. 

n t:s u; NAT()I( 

FUllOI 

RWBOla 

P\VEOC. 

RWl\10.J a 

COMPONENT 

O~ l l'ONEi'iTS 

Unit Length .. 150" [38 101 

Guardrail splice holts and 11111\ 

\V-bcam back-up plntc 

Wide-flange guardrnil post 

W-beam mi l 

l\ISE Wall 

AC('l·: PT,\:\CE 

Ntl.\ltn: n 

10 

2 

2 

I 

I 

Fil WA Acceptance Letter ,,;ll be p11rsued according to the I1.-3 MA Sll pcrfom1ancc cri teria. 

EUE~ S 

McG hee. l\1.D.. Faller, R.K .. Rohde. J.R, Lechtcnbcrg, K.A .. Sickin g. D.L. , Reid. J.D., De1·elop111r111 and El't1/11ar1011 11f 

rite No11-/Jlocked ,\/1d11·cs1 Guardrail System (ilfGS) for ll'1rl'-Faced. ,\/SE Walls. Dra fl Report, Transport ntion Researc h 

Report No. TRP-03-23.J-10. Midwes t Roadsith: Safety Facility. niver it y of Nebraska-Lincoln, J11ly 6, 201 1 

Iloman , D.M .. Thiele, J.C .. Faller, R.K.. Rosenhaugh. S.f.: . Rohde, J.lt, Arens, S.W .. Lech tcnherg, K.A .. Sick ing. D.L .. 

Reid. J.D .. /m·es11ga11011 a11d Dy11a111ic Tes1111g ofWood am/ Stel'I Po.11s for i\!GS 011 a Wire-Faced. ,\/SE Wall. Drnll 

Report Trnnsportation Research Report No. TRP-03-23 1-11 . M id\\CSt Roadsidc Snfcty Facility, Univers ity of Ncbrm,kaLincoln. July 6. 20 11 

Lcchtcnhcrg, K.t\.. Faller, R.K., Sicking. D.L .. Rohde. J.R , Reid. J.D .. ,\'011-BlocJ.ed. J/id1n!SI G11ardrml .\)·s1e111 for 

lf'1re-J-i 1cl'tl. MS£ Walls. Paper No. 11-268..!. Submitted for l'ublicatinn and Pn:scntmion at the 90'h Annunl l\lccting of the 

1 ransportallon Research Board. Washington D.C .. l\ larch 15. 2011 

:-.lc)er. C 1.., Faller. R.K., Lechtcnberg. K.A .. Sicking. DI . Rnhdc. J R . Reid. J.D .. lnves11gn11011 and D.111111111c TeM111g 

ofWood l'o.m .\!GS/or Use inn Wire-Faced ,\/SE Wall. Drnli Report. I rnnsportntion Research Report No. I RP-03 -256· 

11 , l\lld\\e'> t Roadside Safety Facility, University ehra l. 111 coln . in progres) 

CO:'\T,\ CT l :\FOH \ IATIO:'\ 

l\ li1h1est Rombidc Safety Facility 

Nebraska Trnn rtati n Center 

lJn iq:rsil) o f Nebrasl.:t-1 incoln 

130 Whittler Research Center 

2200 Vi ne Street 

Li nco ln , NE 68583 -0853 

(·102) ·172-0965 

Email · m\HSfa uni ed11 

Website: hnp:f/111\1~ f.unl.edu 

MASH TL-3 NON-OLOCKED MGS AOJACE T TO/\ 311 : 1 V SLOPE ON TOP OF A WIRE-FACED, MSE WALL 

SGR39 

Sll EETNO. DATE: 

2 of 4 917/20 11 
J l"[ 87 ] 

MSE WAI I 

SECION C-C 

-

FBBOl 

RW801o 

DE AIL 0 

M/\SH TL-3 ON-BLOCKED MGS ADJI\CENT TO A 311 : IV SLOPE ON TOP OF A WIRE-FACED, MSE \VALL 

SGR39 

SHEET 10. DA.I E: 

3 of 4 917/20 11 
l\1SE SPECI FICATIONS 

The" ire-faced. I\ ISE wall system is configured with three 2-ft (0.6-m) thick layers of roller-compacted. course. crushed 

limestone material and has a 3H: IV fill slope at the outer edge. The soil-aggregate material shall meet the select \\all 

bad.fill materials denoted in Sections 255 and 704 of the 2003 FH\VA Standard .\in!c[ficationsfor Co11stmctio11 ofRomlf 

mu/ /Jridges 0 11 Federal Highway Projects, which also closely conforms to the Grad ing B specifications of AASHTO 

1\ 1147-65 denoted in MASH and NCHRP Report No. 350. The outer region of the bollom two layers shall contain a wall 

facing fill material that consists of 4 to 6-in. ( I 02 to 152-mm) diameter rocks that shall be placed by hand. Steel-wire 

reinforcement mats are used to construct and stabilize the MSE wall system. 

i\ IASI I TL-3 10N-BLOCKED i\ IGS ADJACE 'T TO A 3H: I \I SLOPE ON TOP OF ;\ WIRE-FACED, .\-!SE WALL 

SGR39 -.f ~ • ' I 4 · ..lfl Sll EETNO. DATE: 

4 of4 917120 11