FDOT Standard Plans Index 521-428: Traffic Railing ( 42 " Single - Slope)

Design Criteria

Design Criteria AASHTO Manual for Assessing Safety Hardware (MASH) Test Level 5 Criteria; AASHTO LRFD Bridge Design Specifications ; Structures Design Guidelines ( SDG )

Design Assumptions and Limitations

Design Assumptions and Limitations The 42" Single - Slope Traffic Railing should be used where a railing with Test Level 5 crashworthiness is warranted. Use this railing in accordance with the requirements of SDG 6.7 . The details as shown for installing 2" diameter conduits and associated Embedded Junction Boxes (EJBs) in traffic railings have been determined to be crashworthy in accordance with the requirements of AASHTO Manual for Assessing Safety Hardware (MASH) and the AASHTO LRFD Bridge Design Specifications .

To preserve the crashworthiness of traffic railings, no more than three 2" diameter conduits and associated EJBs, as shown on Index 630 - 0 10, may be installed within a traffic railing or concrete barrier /noise w all. Reinforcing cover for Traffic Railings is shown as 2½", which accommodates new slip forming tolerances. For modified designs 2" minimum cover is usually adequate for stationary form construction.

Design bridge decks supporting 42" Single - Slope Traffic Railings in accordance with the requirements of SDG 4.2 . For bridge decks up to a maximum thickness of 11", the two Bars 5S2 placed in the bridge deck may substitute for the longitudinal deck steel located within the limits of Bars 5V, provided that the total area of longitudinal deck steel beneath the railing , as required by calculation, is not reduced. For treatment of 42" Single - Slope Traffic Railings on skewed bridges see Index 521 - 427.

When required to move water from travel lanes to sidewalks to reduce shoulder spread or to remove water from sidewalk to drainage structures, drainage slots 2” to 3” hig h and 6” to 12” in length may be added to the base of the traffic railing. Work with the Drainage Engineer for size and spacing requirements ; for spacing limits and details see Index 521 - 427 . Note: the 3” slot height will allow bottles and cans to pass through the slot.

See SDM 15.3 when inverted T bent caps are utilized.

General Notes

General Notes Sheet, specify the concrete class in accordance with the superstructure environment classification. See SDG 1.4. Standard Plan s Instructions Topic No.

625 - 010 - 003 Index 521 - 428 Traffic Railing (42" Single - Slope) Include the following Bridge Name Note on the General Notes Sheet: Place the following bridge name on the traffic railing in accordance with the Traffic Railing Standard Plans : [Use the name of the bridge or non - roadway facility crossed, or include the name of both facilities for roadway crossings, e.g.: THOMASVILLE ROAD FLYOVER TOMOKA RIVER CSX RAILROAD US 19 OVER EAST BAY DR For multiple bridges, identify the associated bridge number, e.g.: Bridge No. Name 600103 CHOCTAWHATCHEE BAY 600104 CHOCTAWHATCHEE BAY RELIEF] Show and label, by name or Index number, the 42" Single - Slope Traffic Railing on the Plan and Elevation, Typical Section, Superstructure, Approach Slab and Finish Grade Elevations Cross Section sheets, Retaining Wall Control Drawings, and other sheets as r equired. Indicate the number of conduits to be installed in each railing.

Show limiting stations when transitioning to other types of traffic railings. On the Superstructure section sheets, show the two Bars 5S2 placed in the bridge deck within the Bars 5V along with the rest of the deck steel. When drainage slots are required, i nclude drainage slot size (height and length) and slot locations in the plans , refer to Index 521 - 427 for details .

For approach or trailing end traffic railing or barrier transitions not shown in the Index , provide special end transition details to match the adjacent profile and height at the end of the Approach Slab. Transitions should be made over a 10' - 0" length for the face profile and at 1:8 maximum slope for the height transition. To avoid widening th e approach slab behind the transition, 2" concrete cover may be used.

When using transition from 42” traffic railing on the bridge to 36” or 38” concrete barrier s on the approaches, add coping detail s at the bridge/approach slab interface. Note: Index 521 - 428 traffic railing has a base width of 1’ - 4” from gutterline to coping, and Index 521 - 427 base width is 1’ - 2 ”; the railings must be aligned at the gutterline. The outside coping line can be maintained or adjusted for the 2” reduction in width .

All concrete and Bars 5P, 5S, 6S, 6T and 5V required to construct the traffic railing are included in the Estimated Traffic Railing Quantities. Do not include traffic railing concrete in the estimated concrete quantities, or Bars 5P, 5S, 6S, 6T and 5V in the reinforcing bar lists and estimated reinforcing steel quantities for suppor ting bridge decks, approach slabs or retaining walls.

Payment

Payment Standard Plan s Instructions Topic No. 625 - 010 - 003 Index 521 - 428 Traffic Railing (42" Single - Slope)

Commentary

Commentary: For consistency, Conduit and EJB’s are no longer included in the cost of the Traffic Railing or Concrete Barrier . Item number Item Description Unit Measure 521 - 5 - 14 Concrete Traffic Railing, Bridge 42" Single - Slope LF 630 - 2 - 1 6 Conduit , Furnish & Install, Embedded LF 635 - 3 - 13 Junction Box, Furnish & Install, Embedded EA

What your plans must show

Plan Content Requirements for this index — the SPI's checklist for designers.

• In the Structures Plans: In the