March 27, 2002 

HSA-10/B97 

Mr. Leo J. Yodock, III 

Yodock Wall Company, Inc. 

623 N.E. 5th Terrace 

Ft. Lauderdale, FL 33304 

Dear Mr. Yodock: 

In your March 8 letter to Mr. Frederick Wright, former Program Manager for the 

Safety Core Business Unit, you requested the Federal Highway Administration’s 

acceptance of two traffic barrier designs as National Cooperative Highway Research 

Program (NCHRP) Report 350 test level 2 (TL-2) and test level 3 (TL-3) barriers, 

respectively. To support this request, you also provided copies of three test reports 

prepared by the Texas Transportation Institute and videotapes of the tests that were 

conducted. 

The first report, dated October 2001, is entitled “NCHRP Report 350 Test 2-11 of 

the 813 mm Tall Yodock Barrier Model 2001M, Energy Dispersement Cell with 

Steel Tubing Side Rails Longitudinal Barrier.” The test installation consisted of 25 

low-density polyethylene water-filled barriers, each 1830-mm long, 813-mm tall, 

457-mm wide at the base and 203-mm wide at the top. The individual units are 

connected at the ends with polyethylene couplers and along the sides by 89 mm x 89 

mm x 6.4 mm structural steel tubes supported by steel brackets which extend 

through two forklift holes in each unit. The steel side tubes are 1830-mm long and 

spliced with 280-mm long 64 mm x 64 mm x 6.4 mm steel tubes using two 19-mm 

diameter x 114-mm long Grade 8 hex head bolts. The centerline height of the side 

rails was 596 mm. These design details are shown on Enclosure 1. The results of 

test 2-11, a pickup truck impacting at 68.5 km/h and 24.0 degrees approximately 14 

m from the upstream end of the test installation, are summarized in Enclosure 2. 

All NCHRP Report 350 evaluation criteria were met. Barrier deflection under the 

stated impact conditions was reported to be 3.68 m and the truck stopped in contact 

with the barrier. 

The second report, also dated October 2001, is entitled “NCHRP Report 350 Test 3-

11 of the Yodock Barrier Model 2001, Energy Dispersement Cell with Steel Tubing 

Side Rails for Longitudinal Barrier.” The Model 2001 is similar in design to the 

2001M model, but is larger, being 1170-mm tall, 610-mm wide at the base, and 280-

mm wide at the top. These units were connected along each side by the same size 

steel tubes as described above, but the centerline height of these rails was increased 

to 706 mm. Enclosure 3 shows these and other design details. The results of test 3-

11 are summarized in Enclosure 4. All appropriate evaluation criteria were met, 

although the occupant impact velocity was near the upper limit. Again, the truck 

was stopped in contact with the barrier. Dynamic deflection was reported to be 4.28 

meters, with the impact point approximately 14 m from the upstream end of the 45 

m-long test installation. 
The third report, dated February 2002, is entitled “NCHRP Report 350 Test 3-10 of 

the Yodock Barrier Model 2001, Energy Dispersement Cell with Steel Tubing Side 

Rails for Longitudinal Barrier,” and describes the test with the 820-kg car into the 

taller Model 2001 design. Enclosure 5 summarizes the results of this 97.7 km/h test. 

Based on staff review of the information you provided, I agree that the Model 

2001M Longitudinal Barrier meets Report 350 evaluation criteria at test level 2 

(TL-2), and that the Model 2001 Longitudinal Barrier meets test level 3 (TL-3) 

criteria. Either design may be used as a temporary barrier on the National 

Highway System (NHS) when deemed appropriate by the contracting authority. 

This acceptance is based on the crash performance of your barriers and is not 

meant to address installation, maintenance or repair of the barriers. It also assumes 

that any barrier supplied for use on the NHS is identical in dimensions and material 

specifications to the tested barrier. Since this product is proprietary, the provisions 

of Section 635.411 of Title 23, Code of Federal Regulations, are applicable. 

 Sincerely yours, 

 (original signed by David M. Smith) 

 for A . George Ostensen 

Program Manager, Safety 

5 Enclosures 

 




0.000 s 0.145 s 0.606 s 

General Information

Test Agency ............Test No. . . . . . . . . . . . . . . . .Date . . . . . . . . . . . . . . . . . . .

Test Article

Type . . . . . . . . . . . . . . . . . .Name . . . . . . . . . . . . . . . . . .Installation Length (m) .....Material or Key Elements . .

Soil Type and Condition ....Test Vehicle

Type . . . . . . . . . . . . . . . . . .Designation .............Model ..................Mass (kg)

Curb . . . . . . . . . . . . . . . . .Test Inertial . . . . . . . . . . .Dummy . . . . . . . . . . . . . .Gross Static . . . . . . . . . . .

Texas Transportation Institute400001-YWC509/13/01Median BarrierEnergy Dispersement Cell45.75813 mm tall Yodock EnergyDispersement CellsConcrete Pavement, DryProduction2000P1996 Chevrolet 2500 Pickup Truck21362042No Dummy2042

Impact Conditions

Speed (km/h) ................

Angle (deg) .................

Exit Conditions

Speed (km/h) ................Angle (deg) .................

Occupant Risk Values

Impact Velocity (m/s)

x-direction . . . . . . . . . . . . . . . .y-direction . . . . . . . . . . . . . . . .

THIV (km/h) . . . . . . . . . . . . . . . .Ridedown Accelerations (g's)

x-direction . . . . . . . . . . . . . . . .y-direction . . . . . . . . . . . . . . . .

PHD (g’s) . . . . . . . . . . . . . . . . . . .ASI . . . . . . . . . . . . . . . . . . . . . . .Max. 0.050-s Average (g's)

x-direction . . . . . . . . . . . . . . . .y-direction . . . . . . . . . . . . . . . .z-direction . . . . . . . . . . . . . . . .

68.524.030.04.73.73.215.4-5.4 8.2 8.20.37-3.4 2.9 1.7

Test Article Deflecti

Dynamic . . . . . . . Permanent . . . . . .Working Width . . 

Vehicle Damage

Exterior

VDS . . . . . . . . . CDC . . . . . . . . 

Maximum Exterior

Vehicle Crush (m

Interior

OCDI . . . . . . . . 

Max. Occ. Compart

Deformation (mm

Post-Impact Behavio

(during 1.0 s after iMax. Yaw Angle (deMax. Pitch Angle (d

Max. Roll Angle (de

. Summary of results for test 400001-YWC5, NCHRP Report 350 test 2-11.


0.000 s 0.074 s 0.490 s 

General Information

Test Agency ............Test No. . . . . . . . . . . . . . . . .Date . . . . . . . . . . . . . . . . . . .

Test Article

Type . . . . . . . . . . . . . . . . . .Name . . . . . . . . . . . . . . . . . .Installation Length (m) .....Material or Key Elements . .

Soil Type and Condition ....Test Vehicle

Type . . . . . . . . . . . . . . . . . .Designation .............Model ..................Mass (kg)

Curb . . . . . . . . . . . . . . . . .Test Inertial . . . . . . . . . . .Dummy . . . . . . . . . . . . . .Gross Static . . . . . . . . . . .

Texas Transportation Institute400001-YWC609/14/01Median BarrierEnergy Dispersement Cell45.751160 mm tall Energy Dispersement Cellswith Tubular Steel Rail ElementsConcrete Pavement, DryProduction2000P1996 Chevrolet 2500 Pickup Truck21372041No Dummy2041

Impact Conditions

Speed (km/h) ................

Angle (deg) .................

Exit Conditions

Speed (km/h) ................Exit Trajectory Angle (deg) .....Vehicle Heading Angle (deg) ....

Occupant Risk Values

Impact Velocity (m/s)

x-direction . . . . . . . . . . . . . . . .y-direction . . . . . . . . . . . . . . . .

THIV (km/h) . . . . . . . . . . . . . . . .Ridedown Accelerations (g's)

x-direction . . . . . . . . . . . . . . . .y-direction . . . . . . . . . . . . . . . .

PHD (g’s) . . . . . . . . . . . . . . . . . . .ASI . . . . . . . . . . . . . . . . . . . . . . .Max. 0.050-s Average (g's)

x-direction . . . . . . . . . . . . . . . .y-direction . . . . . . . . . . . . . . . .z-direction . . . . . . . . . . . . . . . .

98.424.811.627.580.511.6 2.342.6-10.0 -6.1 10.5 1.11-13.3 4.2 -4.7

Test Article Deflecti

Dynamic . . . . . . . Permanent . . . . . .Working Width . . 

Vehicle Damage

Exterior

VDS . . . . . . . . . CDC . . . . . . . . 

Maximum Exterior

Vehicle Crush (m

Interior

OCDI . . . . . . . . 

Max. Occ. Compart

Deformation (mm

Post-Impact Behavio

(during 1.6 s after iMax. Yaw Angle (deMax. Pitch Angle (dMax. Roll Angle (de

Summary of results for test 400001-YWC6, NCHRP Report 350 test 3-11.
0.000 s 0.122 s 0.244 s 

General Information

Test Agency ............Test No. . . . . . . . . . . . . . . . .Date . . . . . . . . . . . . . . . . . . .

Test Article

Type . . . . . . . . . . . . . . . . . .Name . . . . . . . . . . . . . . . . . .Installation Length (m) .....Material or Key Elements . .

Soil Type and Condition ....Test Vehicle

Type . . . . . . . . . . . . . . . . . .Designation .............Model ..................Mass (kg)

Curb . . . . . . . . . . . . . . . . .Test Inertial . . . . . . . . . . .Dummy . . . . . . . . . . . . . .Gross Static . . . . . . . . . . .

Texas Transportation Institute400001-YWC801/28/02Median BarrierYodock Model 2001 EnergyDispersement Cell36.581170 mm Tall Energy Dispersement CellsWith Tubular Steel Rail ElementsConcrete Pavement, DryProduction820C1996 Geo Metro820820 76896

Impact Conditions

Speed (km/h) ................

Angle (deg) .................

Exit Conditions

Speed (km/h) ................Angle (deg) .................

Occupant Risk Values

Impact Velocity (m/s)

x-direction . . . . . . . . . . . . . . . .y-direction . . . . . . . . . . . . . . . .

THIV (km/h) . . . . . . . . . . . . . . . .Ridedown Accelerations (g's)

x-direction . . . . . . . . . . . . . . . .y-direction . . . . . . . . . . . . . . . .

PHD (g’s) . . . . . . . . . . . . . . . . . . .ASI . . . . . . . . . . . . . . . . . . . . . . .Max. 0.050-s Average (g's)

x-direction . . . . . . . . . . . . . . . .y-direction . . . . . . . . . . . . . . . .z-direction . . . . . . . . . . . . . . . .

97.719.826.295.9 11.0 3.7 41.4-10.4 2.7 10.7 1.03-11.0 5.3 -2.1

Test Article Deflect

Dynamic . . . . . . Permanent . . . . . Working Width . 

Vehicle Damage

Exterior

VDS . . . . . . . . CDC . . . . . . . 

Maximum Exterior

Vehicle Crush (

Interior

OCDI . . . . . . . 

Max. Occ. Compa

Deformation (m

Post-Impact Behav

(during 1.0 s after Max. Yaw Angle (Max. Pitch Angle Max. Roll Angle (d

Summary of results for test 400001-YWC8, NCHRP Report 350 test 3-10.