Specifications_-_Plans_-_FDOT_Loop_Standard.pdf

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Twisted Pair or Loop Lead-In in Saw-Cut

Flexible Conduit

PVC Coated

Flexible Conduit

PVC Coated

Twisted Pair or Loop Lead-In in Saw-Cut

Rigid Conduit

Connector

Gutter Gutter

Edge of Roadway Slot

Twisted Pair or Loop Lead-In in Saw-Cut

Twisted Pair or Loop Lead-In in Saw-Cut

PVC Coated Flexible Conduit

PVC Coated Flexible Conduit

Slot (See General Note 8)

Roadway Pavement

Slot (See General Note 8)

Intermediate Pullbox Intermediate Pullbox

21660-001

VEHICLE LOOP INSTALLATION DETAILS

11/01/18

ALTERNATIVE 2

TWISTED PAIR AND LOOP LEAD-IN INSTALLATION

INSTALLATION WITHOUT CURB & GUTTER

INSTALLATION WITH CURB & GUTTER

To Pullbox or Cabinet

To Pullbox or CabinetTo Pullbox or Cabinet

ELEVATION

PLAN

ALTERNATIVE 1

NOTES:

the roadway is between 30° to 45°.

3. The departure angle of the conduit from

2" below the top of the roadway surface.

roadway pavement and approximately

2. Install the conduit at least 6" into the the end of the flexible conduit.

sufficient size and depth to snugly place

1. Cut a slot in the edge of the roadway of

GENERAL NOTES:

Operations Engineer.

8. Alternative installations may be approved by the State Traffic asphalt as directed by the Engineer.

7. Do not disturb more than a 6" x 6" area of asphalt. Restore exposed end of the shielded cable may be used.

that will accommodate both the splices of the conductors and the the shielded cable. As an alternate, a larger diameter enclosure conductor and place a third enclosure over the exposed end of insulated enclosures. Place one enclosure over the end of each

6. Splice Connections in pull boxes with UL listed, watertight, wire is 6" from the loop to 12" from the pavement edge or curb.

5. The minimum distance between the twisted pairs of loop lead-in intervals on lead-ins.

material approximately 12" intervals around loops and 24" lead-ins to the bottom of saw-cuts. Place the hold down

4. Use nonmetallic hold down material to secure loop wires and loop wires and lead-in cables in a saw cut in the structural course.

prior to the placement of the asphalt friction course. Place the loop wires and lead-in cables in the asphalt structural course

3. On resurfacing or new roadway construction projects, install the than 4" below the top of the final surface.

expansion joints, saw-cut to a standard depth of 3", but no more loop wires or lead-in cables into the saw-cut. Except across

2. Provide sufficient saw-cut width to allow unforced placement of wire and continue to the controller cabinet.

twisted pair an Intermediate Pullbox, splice to shielded lead-in cabinet. If the loop lead-in is greater than 75' continue the detector to controller cabinet, continue the twisted pair to the

1. If the loop lead-in is 75' or less from the edge of the loop

NOTES:

sealant from entering the flexible conduit.

5. Use a nonmetallic material to prevent excessive loop level of the curb surface.

4. Fill the top of the hole with loop sealant to the

3. Insure the conduit fits snug within the drilled hole.

not within 2" of the top of the hole.

into the hole from the back side of the curb but

2. Install a section of flexible conduit at least 6" prior to cutting the top inside edge of the curb.

the required saw-cut depth is obtained just

1. Drill a hole through the curb at the point which

NOTES:

sealant from entering the rigid conduit.

5. Use a nonmetallic material to prevent excessive loop roadway surface.

4. Fill the hole with loop sealant to the level of the the roadway surface.

3. Place the top of the rigid conduit approximately 2" below end of the rigid conduit.

2. Install a molded bushing (nonmetallic) on the roadway angle to intercept the trench or pull box hole.

(or concrete) surface and base at an appropriate rigid conduit to be used through the roadway asphalt

" to 1" larger in diameter than the 2

11. Drill a hole

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Pavement Joint Double Width Cut

Loop Wires

Sealant

Deep Section of Groove Over Wire

Soft-Setting Sealer Injected Into

Loop Wires

Type 'B'

Type 'B'

Shielded Lead-In

Type 'B'

Type 'B'

Stop Line

Stop Line Stop Line

Stop Line

Stop Line

Stop Line

Stop Line

2 Turns

3 Turns

2 Turns

4 Turns 2 Turns

4 Turns

2 Turns

2 Turns 4 Turns

2' 2'

3'-6"

2'

2'

3'

22660-001

VEHICLE LOOP INSTALLATION DETAILS

11/01/18

3"

2"

3'-6"

3"

CONCRETE PAVEMENT EXPANSION JOINTS

VERTICAL SECTION

PLAN

TYPE F

TYPE E

TYPE D

TYPE C

TYPE B

TYPE A

TYPE G

LOOP CORNER AND LEAD-IN DETAILS

3'3'

8'8'

Variable

6'

3'

6'

6'

Variable

6'

1' 1'1'

1'

1'

Variable

Variable

Variable

Variable

Items.

Under Separate Pay

Pullbox Specified

Loops To Pullbox.

NOTE:

LOOP TYPES, EXPANSION JOINTS, AND DETAILS

to bottom forming slack section at joint.

Loop conductors must follow saw-cut

NOTE:

LOOP TYPES

NOTES:

pull box with signal power cable.

Do not install loop lead-in wires in the same 7.

maximum of 60'.

length of these loops may be extended to a the stop line a maximum of 10' and the of loop Types A, C, D, & F may extend past

When shown in the Plans, the leading edge 6.

loop.

Lead-in may be connected to either end of 5.

loop may vary up to a maximum of four (4).

The number of individual loops in the Type G 4.

lanes.

except Type E which is centered on two

Loop Types are centered in a single lane 3.

Loop types or details not drawn to scale.2.

loop.

placed in the saw-cut forming the complete number of passes of loop wires which are specified point on the loop refers to the

The number of "Turns" indicated at the 1.