SUMMARY CHANGES FOR SUMMARY CHANGES FOR NCHRP REPORT 350 NCHRP REPORT 350

GUIDELINES GUIDELINES [NCHRP 22-14 (02)][NCHRP 22-14 (02)]

Keith A. Cota, Chairman Keith A. Cota, Chairman Technical Committee Technical Committee

on Roadside Safetyon Roadside SafetyMay 4, 2007May 4, 2007

BACKGROUNDBACKGROUND

•Circular 482 – (1962) – First full Circular 482 – (1962) – First full scale crash test proceduresscale crash test procedures

•Circular 191 – (1978)Circular 191 – (1978)

•NCHRP Report 230 – (1980) NCHRP Report 230 – (1980)

•NCHRP Report 350 – (1993)NCHRP Report 350 – (1993)

•NCHRP 22-14(02) – Adoption NCHRP 22-14(02) – Adoption 2007/08 ?2007/08 ?

350 Category Changes350 Category Changes

• Test matrices and conditions.

• Test installation.

• Test vehicle specifications.

• Evaluation criteria.

• Test documentation.

• In-service performance evaluation.

TEST MATRICES AND TEST MATRICES AND CONDITIONS CONDITIONS

• Small car impact angle (20 degree to 25 degree).• Impact speed for single unit truck test (80 km/h to 100

km/h).

• Occupant risk for length-of-need tests.• Impact angle for terminals and crash cushions (20

degree to 25 degrees).

• Gating terminal/crash cushion (Reduce angle from 15 degrees to 5 degrees).

• Mid-size car test (Add 1500A test vehicle for staged impact attenuation devices).

TEST MATRICES AND TEST MATRICES AND CONDITIONS (Cont’d)CONDITIONS (Cont’d)

• Barrier testing heights (Establish max. for small vehicle and min. height for pickup test).

• CIP’s for terminals and redirective crash cushions (Test CIP at barrier change from redirective to gating or capture point) .

• CIPs for reverse direction impacts.

• TMA optional tests to mandatory (Define max/min truck weight, control ballast shifting and vehicle braking).

• Variable message sign and arrow board trailers (Require same test criteria as TMA’s) .

TEST MATRICES AND TEST MATRICES AND CONDITIONS (Cont’d)CONDITIONS (Cont’d)

• Support structures and work zone traffic control devices (Add light truck test in addition to the small vehicle testing criteria).

• Longitudinal channelizing barricades (Add

new category and recommended test matrix).

• EDR data collection EDR data collection (Provide data on impact conditions (Provide data on impact conditions

and accelerations from vehicle)and accelerations from vehicle)..

TEST INSTALLATION TEST INSTALLATION

• Soil Condition Soil Condition (soil type, gradation, (soil type, gradation,

compaction and density)compaction and density) . .

• Embedment of Posts Embedment of Posts (not necessary (not necessary with reporting of soil conditions)with reporting of soil conditions)

• Components Components (provide documentation of (provide documentation of components used).components used).

• Installation Lengths Installation Lengths (document length (document length of test installation).of test installation).

TEST VEHICLESTEST VEHICLES• Test vehicles Test vehicles (change small vehicle and pickup).(change small vehicle and pickup).

• Single unit truck mass Single unit truck mass (from 8000 to 12000 kg).(from 8000 to 12000 kg).

• Light truck test vehicle Light truck test vehicle (Minimum c.g. height of 28 inches)(Minimum c.g. height of 28 inches) • Vehicle age Vehicle age (six years older or less).(six years older or less).

• Truck box attachment Truck box attachment (limit detachment, reduce inconclusive (limit detachment, reduce inconclusive

testing results)testing results) . .• Vehicle damage Vehicle damage (document external vehicle crush damage using (document external vehicle crush damage using

NASS procedures)NASS procedures) . .• Crushable nose characteristics Crushable nose characteristics (develop updated (develop updated

surrogate vehicle testing from 1981 Volkswagen Rabbit).surrogate vehicle testing from 1981 Volkswagen Rabbit).• TMA support vehicle TMA support vehicle (Report maximum weight of (Report maximum weight of

support vehicle). support vehicle).

EVALUATION CRITERIAEVALUATION CRITERIA

• Occupant risk Occupant risk (Modify calculations for Occupancy Impact Velocity (Modify calculations for Occupancy Impact Velocity and Ridedown Acceleration with vehicle yawing).and Ridedown Acceleration with vehicle yawing).

• Windshield damage Windshield damage (Provides more quantitative criteria; apply criteria (Provides more quantitative criteria; apply criteria to structural support devices the same for work zone devices).to structural support devices the same for work zone devices).

• Occupant compartment damage Occupant compartment damage (Set objective criteria).(Set objective criteria).

• Marginal pass Marginal pass (Strictly pass or fail criteria results).(Strictly pass or fail criteria results).

• Maximum roll angle Maximum roll angle (Roll and pitch angle at 75 degrees).(Roll and pitch angle at 75 degrees). • Exit conditions Exit conditions (Report lane intrusions and exit angle with exit box (Report lane intrusions and exit angle with exit box

criteria).criteria).

• Vehicle rebound for crash cushions Vehicle rebound for crash cushions (reporting criteria) .(reporting criteria) .

TEST DOCUMENTATIONTEST DOCUMENTATION

• CAD drawings CAD drawings (AutoCAD or Micro Station drawing files)(AutoCAD or Micro Station drawing files)

• Test report Test report (More detailed documentation on conducted of the test (More detailed documentation on conducted of the test

and the test results).and the test results).

IN-SERVICE EVALUATIONIN-SERVICE EVALUATION• Encourage in-service evaluation to Encourage in-service evaluation to

demonstrate satisfactory field performance.demonstrate satisfactory field performance.• Pool resources (partnering) between State Pool resources (partnering) between State

proprietary device manufacturers.proprietary device manufacturers.• Disseminate information through resource Disseminate information through resource

channels like National Technical Information channels like National Technical Information Services (NTIS), FHWA regional resource Services (NTIS), FHWA regional resource centers and State pooled fund consortiums.centers and State pooled fund consortiums.

• Consider the establishment of new national Consider the establishment of new national center on in-service evaluation. center on in-service evaluation.

NCHRP 22-14(02) NCHRP 22-14(02) Full Scale Crash TestsFull Scale Crash Tests

• Strong Post Double Beam System (with Strong Post Double Beam System (with 5000 # pickup truck) – passed TL-3 test 5000 # pickup truck) – passed TL-3 test criteriacriteria

• Midwest Guardrail System (with 5000 # Midwest Guardrail System (with 5000 # pickup truck & 2400 # small vehicle) – pickup truck & 2400 # small vehicle) – passed TL-3 test criteriapassed TL-3 test criteria

• New Jersey Shaped Concrete Barrier (with New Jersey Shaped Concrete Barrier (with 2400 # small vehicle) – passed TL-3 test 2400 # small vehicle) – passed TL-3 test criteriacriteria

• F-Shape temp. concrete barrier with 3-loop F-Shape temp. concrete barrier with 3-loop connection (with 5000 # pickup truck) – connection (with 5000 # pickup truck) – passed TL-3 criteriapassed TL-3 criteria

NCHRP 22-14(02) NCHRP 22-14(02) Full Scale Crash Tests, Con’tFull Scale Crash Tests, Con’t

• Iowa Transition (with 5000 # pickup Iowa Transition (with 5000 # pickup truck) – passed TL-3 criteriatruck) – passed TL-3 criteria

•Tangent Guardrail terminal (with Tangent Guardrail terminal (with 2400 # sedan) – passed TL-3 criteria2400 # sedan) – passed TL-3 criteria

•New Jersey Shaped Concrete Barrier New Jersey Shaped Concrete Barrier (32 inches) (with 10,000 kg single (32 inches) (with 10,000 kg single unit truck) – did not pass TL-4 criteriaunit truck) – did not pass TL-4 criteria

AASHTO/FHWA AASHTO/FHWA IMPLEMENTATION PLANIMPLEMENTATION PLAN

DRAFT UNDER REVIEW BY DRAFT UNDER REVIEW BY TCRSTCRS

AASHTO/FHWA AASHTO/FHWA Implementation Plan (Draft)Implementation Plan (Draft)

All hardware and devices passed All hardware and devices passed under NCHRP 350 may remain in under NCHRP 350 may remain in place, continue to be manufactured, place, continue to be manufactured, and installed.and installed.

Upon adoption of the new evaluation Upon adoption of the new evaluation procedures by AASHTO, any new procedures by AASHTO, any new hardware or device not previously hardware or device not previously evaluated shall utilize the new evaluated shall utilize the new procedures for evaluation and testing.procedures for evaluation and testing.

Implementation Plan, Implementation Plan, Con’tCon’t

Any hardware or devices Any hardware or devices accepted under testing accepted under testing procedures prior to 350 and in procedures prior to 350 and in place are encouraged to be place are encouraged to be replaced during major highway replaced during major highway and bridge reconstruction and bridge reconstruction projects.projects.

Implementation Plan, Implementation Plan, Con’tCon’t

Any new or revised hardware or device Any new or revised hardware or device under development at the time the under development at the time the new procedures are adopted, may new procedures are adopted, may continue testing under the NCHRP 350 continue testing under the NCHRP 350 criteria. However, FHWA will not issue criteria. However, FHWA will not issue acceptance letters for any new or acceptance letters for any new or revised hardware or devices under revised hardware or devices under NCHRP 350 criteria after 24 months NCHRP 350 criteria after 24 months following adoption by AASHTO of the following adoption by AASHTO of the new criterianew criteria. .

TCRS Schedule for TCRS Schedule for AdoptionAdoption

• May 15 & 16, Spring meeting in Woods Hole, May 15 & 16, Spring meeting in Woods Hole, MA to review final document from NCHRP 22-MA to review final document from NCHRP 22-14(02) panel14(02) panel

• Finalize Draft Implementation Plan with FHWA Finalize Draft Implementation Plan with FHWA • Ballot TCRS results completed by September Ballot TCRS results completed by September

12-14, 2007 meeting in Seattle, Wash. 12-14, 2007 meeting in Seattle, Wash. • Ballot SCOD in Fall of 2007 Ballot SCOD in Fall of 2007 • Ballot SCOH in Winter of 2007/08 Ballot SCOH in Winter of 2007/08 • Complete NCHRP 22-14(03) with additional Complete NCHRP 22-14(03) with additional

full scale crash testing of non-proprietary full scale crash testing of non-proprietary devices using the new criteria (Completion in devices using the new criteria (Completion in 2008/09)2008/09)

CONTACT INFORMATIONCONTACT INFORMATION

Keith A. Cota, ChairmanKeith A. Cota, ChairmanAASHTO – Technical Committee on AASHTO – Technical Committee on

Roadside Safety Roadside Safety New Hampshire DOTNew Hampshire DOTHazen Drive, PO Box 483 Hazen Drive, PO Box 483 Concord, NH 03302-0483Concord, NH 03302-0483Tel: 603-271-1615Tel: 603-271-1615Email: kcota@dot.state.nh.usEmail: kcota@dot.state.nh.us