Traffic and Roadway Dan Groh, P.E. Construction Traffic & Roadway - - PDF document

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Traffic and Roadway

Dan Groh, P.E. Construction Traffic & Roadway Eng., Division of Construction Management Ohio Department of Transportation 1980 West Broad St (Mail Stop 5190) Columbus, OH 43223 Phone: 614‐387‐1162 Dan.Groh@dot.state.oh.us

606 GUARDRAIL

• Changing from Type 5 to Midwest Guardrail

System (MGS)

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Type 5 Guardrail

• 27” Tall Guardrail determined NOT

crashworthy (too short)

• 29” Acceptable per NCHRP 350
• The “GR‐Series” standard drawings retired

as Plan Insert Sheets available for repair or projects that were designed with Type 5

Too Short

Guardrail Systems

• Type 5

‐ NCHRP 350 crashworthy ‐ 29” with 1” tolerance ‐ 8” deep blockout ‐ Rail splices at post

• MGS

‐ MASH crashworthy ‐ 31” with 1” tolerance ‐ 12” deep blockout ‐ Rail splices offset from the post

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Type 5 MGS

Splice 12”

12” Blockouts

• A 2‐piece block option

comprised of a 4” wood piece nailed to an 8” block.

• if this turns into a

maintenance problem (blocks splitting, cracking, shrinking/rotating) then we will revert to a

• ne‐piece solid block

requirement.

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Cross Section with Curb

• Type 5

‐ 8” Blockout ‐ Face of Rail at Face of Curb

• MGS

‐ 12” Blockout ‐ Face of rail up to 6” behind curb

Standard Posts Cross Section

• Type 5

‐ 2 ft. from the face

• f rail to break

point ‐ 10:1 approach slope

• MGS

‐ 1 ft. from back of post to break point ‐ 8:1 approach slope

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Longer Posts Down Slope

• Type 5

‐ 9 ft. posts ‐ Up to 2 ft. off treated shoulder

• MGS

‐ 7.5 ft. wood posts (8 ft. steel) ‐ Face of rail at slope break

Guardrail Flare Rates

• Type 5

‐ Rate Varies with speed ‐ 60 MPH with a 13:1 flare

• MGS

‐ Max 7:1 flare for all design speeds

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Transitions: Bridge Terminal Assemblies (BTAs)

• Type 5

‐ Type 1 ‐ Type 2 ‐ Type 3 ‐ Type 4 ‐ Type TST

• MGS

Type 1 Type 2 No more Type 3 & 4 TBR & DBR transitions, use Type 5 TST incorporated into Type 1

Old Type 1 BTA

 Payment Quantity:

‐

“Includes the cost of extra components in excess of normal guardrail”

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New Type 1 BTA

 Payment Quantity:

‐ Paid as one item for all the components within the length of

the transition

MGS ‐ No Transition from needed to Semi‐Rigid Culvert Rail

Headwall Needs to be Designed to Align with Guardrail Run No transition

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No structural Damage – Just replace posts

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Midwest Guardrail System

• Other approved installations

–Half post spacing –Quarter post spacing –25’ longspan –Median barrier –Possible Reduced blockout on non‐NHS routes (check with Office of Roadway Engineering)

614 MAINTAINING TRAFFIC

• 614.02 ‐ Traffic facilities

–B. Changed the language to require Contractor to maintain the roadway including potholes and added other pavement deficiencies.

• 614.03 ‐ Traffic Control General

–Added Conspicuity requirements for project vehicles

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614 MAINTAINING TRAFFIC

• 614.11 ‐ Work zone pavement markings

– G. Conflicting markings ‐

• Deleted the Removal Method Table and replaced with

verbiage describing acceptable pavement marking removal methods.

• 614.14 ‐ Performance

– Identify all pavement deficiencies within the work area. Repair deficiencies as soon as possible and within 24 hours from notice of the deficiency.

622 CONCRETE BARRIER

• 622.04 – Portable barrier

– Portable concrete barrier is now portable barrier to allow for steel

• barrier. The Contractor may

substitute approved proprietary portable barrier products which can be found on the Office of Roadway Engineering’s website.

• 622.09 ‐ Basis of payment

– Added pay item unit and description for reinforced end anchorages and end sections.

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630 TRAFFIC SIGNS AND SIGN SUPPORTS

• 630.07 ‐ Sign erection

– Added “Mount overhead signs so that the bottom of the signs are in a level position regardless of the sag

• f supporting messenger wire, mast arm rise, chord

member or overpass slope.

• 630.12 ‐ Removal and delivery, storage, re‐

erection, or disposal of signs and supports

– Signs and Sign Supports can now either be stored on the project or delivered to a facility for ODOT usage.

631 SIGN LIGHTING AND ELECTRICAL SIGNS

• 631.10 ‐ Removal

–Sign Lighting and Electrical Signs now become the property of the Contractor.

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632 TRAFFIC SIGNAL EQUIPMENT

• 632.11 ‐ Detector loops

– Conform to all applicable state and local nuisance dust regulations while saw cutting.

• 632.225 ‐ Tether wire

– Modified that tether wire shall be those shown in the appropriate Plan Insert Sheet or Standard Construction Drawing and include pole clamps, anchor shackles, S‐hooks yielding element, thimbles, turnbuckles, guy grips, wire rope clips, backup ties, lock wire, safety tie wires, and signal head tether anchors and extenders.

632 TRAFFIC SIGNAL EQUIPMENT

• 632.25 ‐ Covering of vehicular and pedestrian

signal heads – Added language that use of cover materials are specifically made for use with traffic signals, and ensure that the color of the cover is different than the signal head, tan or beige, so that it is clear to drivers and pedestrians the heads are covered, not dark. Also covers are to be free of text, pictures or any type of advertising.

• 632.28 ‐ Testing

– Added verbiage to section F (function test) that ODOT specifications must now require vehicle stop bar detectors pick up motorcycles and bicycles.

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633 TRAFFIC SIGNAL CONTROLLERS

• 633.03 ‐ Materials and

equipment

– Add language for the warranty items, that a sticker with the manufacturing date (determined by serial number) within one (1) year

• f the date of shipment to the

project is displayed to easily determine when the warranty has expired.

648 SPRAY THERMOPLASTIC PAVEMENT MARKING

• Moved Supplemental Spec 817 and 917

into the book

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Questions?