Standard Construction Details 2026
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Important Notice
In the effort to update the Standard Construction Details and Standard Specifications per the 2026 review, all detail sheets have been reviewed and sheet changes have been noted with new title block and signatures. Major efforts of this update include addition of 2016 MASH compliance as accepted by the Department, consistency with the 2026 DelDOT Standard Specifications, consistency with Department and regulatory publications, and edits of the Details were made to meet the current methods of construction.
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2026 Standards
2026 DelDOT Standard Details 2026 DelDOT Standard Details Revised Sheets 2026 Index Sheets 2026 Memo to Current Holders - List of Changes 2026 DelDOT Standard Details.zip
Section I - Barrier
B-L (2026) - Barrier Legend
B-1 - Guardrail Applications (Type 1-31, 2-31, and 3-31)
B-1 (2024) -1- Plan Views B-1 (2024) -2- Elevation Views and Splice Details B-1 (2025) -3- Section Views B-1 (2026) -4- Type 1-31, Guardrail with Omitted Post B-1 (2024) -5- Type 1-31, Guardrail Steep Slope
B-2 - Grading for Guardrail End Treatments (Types 1, 2, and 3)
B-2 (2024) -1- Grading For Guardrail End Treatment Attenuator, Type 1 & Type 2 B-2 (2024) -2- Grading For Guardrail End Treatment Attenuator, Type 3
B-3 - Guardrail Over Culverts (Types 2-31, and 3-31)
B-3 (2024) -1- Guardrail Over Culverts, Type 2-31 B-3 (2024) -2- Guardrail Over Culverts, Type 3-31
B-4 - RESERVED
B-5 - Steel-Post End Anchorage, Type 31
B-5 (2025) -1- Plan and Elevation View B-5 (2025) -2- Insets B-5 (2025) -3- Upper and Lower Post Assembly B-5 (2025) -4- Breaker and Ground Strut Assemblies B-5 (2026) -5- Swaged Cable Assemblage and Component List
B-6 - RESERVED
B-7 (2024)-1- W-Beam, Type 1-27 to Type 1-31 Transition Section
B-8 - Guardrail to Barrier Connection - Approach and Exit Type 1-31
B-8 (2024) - 1 - Approach Type 1-31 B-8 (2020) - 2 - Type 1 Hardware B-8 (2020) - 3 - Bent Plate Rub Rail B-8 (2020) - 4 - Exit Type 1-31
B-9 - Guardrail to Concrete Median Barrier Transition
B-9 (2025) - 1 - Plan and Elevation View B-9 (2025) - 2 - Rub Rail Bracket B-9 (2025) - 3 - Rub Rail Termination B-9 (2025) - 4 - Rub Rail, Blockouts, and Post B-9 (2026) - 5 - Concrete End Buttress
B-10 - Guardrail to Barrier Connection - Type 3-31
B-10 (2026) - 1 - Approach, Type 3-31 B-10 (2020) - 2 - Post B-10 (2026) - 3 - Post and Offset Block B-10 (2026) - 4 - Terminal End Shoe and Connection
B-11 - Thrie-Beam Approach Guardrail Transition (AGT) To Connection Buttress - ARCHIVE 2026 B-12 - RESERVED
B-13 - Hardware
B-13 (2020) - 1 - W-Beam Section and Elevation Views B-13 (2020) - 2 - W-Beam Steel Post and Offset Block B-13 (2020) - 3 - W-Beam Terminal Connector B-13 (2020) - 4 - Thrie Beam and Thrie Beam Expansion Section and Elevation B-13 (2020) - 5 - Thrie Beam Steel Post and Offset Block B-13 (2020) - 6 - Asymmetric and Symmetric W-Beam to Thrie Beam Transition Section B-13 (2020) - 7 - Wood Offset Blocks, Soil Plate, Steel Tube and Wood Breakaway Posts B-13 (2025) - 8 - End Anchorage Hardware B-13 (2026) - 9 - Reflector and W-Beam Bearing Plate B-13 (2021) - 10 - Guardrail Mounted Rail - ARCHIVED B-13 (2020) - 11 - Downstream Anchorage System - Ground Strut & Anchor Bracket B-13 (2020) - 12 - Guardrail to Barrier Connection - Thrie-Beam Terminal Connector
B-14 - RESERVED
B-15 - Guardrail Applications (Types 1-27, 2-27, and 3-27)
B-15 (2020) - 1 - Plan Views B-15 (2020) - 2 - Elevation Views and Splice Details B-15 (2020) - 3 - Section Views
B-16 - RESERVED
B-17 (2020) - Guardrail End Treatment, Type 4-27
B-18 (2025) - Curved Guardrail Section, Type 1-27
B-19 - RESERVED
B-20 - Burried In Back Slope End Terminal, Type 1-31
B-20 (2024) - 1 - Perspective and Elevation Views B-20 (2020) - 2 - Section Views B-20 (2020) - 3 - Hardware B-20 (2024) - 4 - Posts
B-21 - 35" Concrete End Buttress
B-21 (2026) - 1 - 35" Concrete End Buttress B-21 (2026) - 2 - 35" Concrete End Buttress - TL-3 Reinforcement B-21 (2026) - 3 - 35" Concrete End Buttress - TL-4 Reinforcement B-21 (2026) - 4 - 35" Concrete End Buttress - TL-5 Reinforcement
B-22 - 32" Concrete End Buttress
B-22 (2026) - 1 - 32" Concrete End Buttress
B-22 (2026) - 2 - 32" Concrete End Buttress - TL-3 Reinforcement
B-22 (2026) - 3 - 32" Concrete End Buttress - TL-4 Reinforcement
B-22 (2026) - 4 - 32" Concrete End Buttress - TL-5 Reinforcement
B-23 - RESERVED
B-24 - RESERVED
B-25 - Concrete Roadside Barrier
B-25 (2025) - 1 - Section and Elevation Views B-25 (2025) - 2 - Grading Alternatives B-25 (2025) - 3 - Foundation Alternatives
B-26 - Concrete Median Barrier,
B-26 (2025) - 1 - Section and Elevation Views B-26 (2025) - 2 - Foundation Alternatives
Section II - Curb & Gutter
C-1 - PCC Curb
C-1 (2025) - 1 - Typical PCC Curb Section and Typical Taper Section C-1 (2025) - 2 - Integral PCC Curb & Gutter C-1 (2024) - 3 - Integral PCC Curb & Gutter (For Use At Pedestrian Connections Only) C-1 (2024) - 4 - PCC Roundabout and Guardrail Curb
C-2 - Pedestrian Connection
C-2 (2026) - 1 - General Notes C-2 (2024) - 2 - Type 1 C-2 (2026) - 3 - Type 1 C-2 (2024) - 4 - Type 2 C-2 (2024) - 5 - Type 3 C-2 (2025) - 6 - Type 4 C-2 (2025) - 7 - Type 5 C-2 (2025) - 8 - DWS and DTSI Placement
C-3 - Entrances
C-3 (2025) - 1 - PCC Entrances Without Pedestrian Connections C-3 (2025) - 2 - Hot-Mix Entrances Without Pedestrian Connections
C-4 (2025) - 1 - Curb Opening
C-5 - Curb/Sidwalk Opening
C-5 (2026) - 1 - Integral PCC Curb & Gutter Type 1-8 and Not Adjacent to Curb Installations C-5 (2026) - 2 - Integral PCC Curb & Gutter Type 3-8
C-6 (2024) - Curb Retaining Wall
Section III - Drainage
D-1 - 6:1 Safety End Structure
D-1 (2018) - 1 - Detail Views D-1 (2018) - 2 - Schedules
D-2 - 10:1 Safety End Structure
D-2 (2018) - 1 - Detail Views D-2 (2018) - 2 - Schedules
D-3 - Safety Grates
D-3 (2020) - 1 - Safety End Structure Grate and Assembly D-3 (2025) - 2 - Personnel Safety Grate For Pipe Inlet
D-R (2026) - Drainage Inlet Reference Sheet
D-4 (2026) - Inlet Box - Fabrication
D-5 - Drainage Inlet Details
D-5 (2026) - 1 - Drainage Inlet Assembly D-5 (2026) - 2 - Drainage Inlet Frame and Grates D-5 (2024) - 3 - Drainage Inlet top Units D-5 (2025) - 4 - Drainage Inlet Cover Slab D-5 (2026) - 5 - Double Inlet Cover Slab D-5 (2026) - 6 - 34" X 24" Drainage Inlet D-5 (2026) - 7 - 34" X 18" Drainage Inlet D-5 (2022) - 8 - Drainage Inlet top Unit, Type S D-5 (2026) - 9 - Doghouse Inlet Box
D-6 - Manhole Details
D-6 (2026) - 1 - Box Manhole Assembly D-6 (2025) - 2 - Round Manhole Assembly D-6 (2026) - 3 - Manhole Grade Ring, top Unit, Frame and Cover D-6 (2026) - 4 - Box Manhole Cover Slab D-6 (2026) - 5 - Round Manhole Cover Slab
D-7 - RESERVED
D-8 (2021) - Pipe Bedding and Pipe Flared End Support
D-9 (2024) - Perforated Pipe Underdrain
D-10 (2024) - Pipe Plugging
Section IV - Erosion
E-1 (2024) - Concrete Washout
E-2 Silt Fence
E-2 (2020) - 1 - Silt Fence E-2 (2026) - 2 - Super Silt Fence
E-3 (2024) - Sediment Trap
E-4 (2024) - Inlet Sediment Control, Drainage Inlet
E-5 (2026) - Inlet Sediment Control, Culvert Inlet
E-6 (2020) - Portable Sediment Tank
E-7 (2014) - Sump Pit
E-8 (2024) - Skimmer Dewatering Device
E-9 Check Dam
E-9 (2020) - 1 - Stone Check Dam E-9 (2020) - 2 - Compost Filter Log Check Dam
E-10 (2024) - Temporary Slope Drain
E-11 (2014) - Incremental Stabilization
E-12 - RESERVED
E-13 - RESERVED
E-14 (2024) - Stabilized Construction Entrance
E-15 (2024) - Sandbag Dike
E-16 (2014) - Sandbag Diversion
E-17 (2024) - Geotextile-lined Channel Diversion
E-18 (2014) - Turbidity Curtain
E-19 (2020) - Stilling Well
E-20 (2025) - RipRap Stilling Basin
E-21 (2026) - Stone Outlet
Section V - Landscaping
L-1 - Planting Details
L-1 (2024) - 1 - Roadside Shrub Planting Detail
L-1 (2024) - 2 - Tree Planting Detail
L-1 (2024) - 3 - Perennial/Ground Cover Planting Detail
L-1 (2024) - 4 - Aquatic Planting Detail
Section VI - Miscellaneous
M-1 (2021) - Right-of-Way Fence
M-2 (2026) - Right-of-Way Monumentation
M-3 (2024) - Shared-Use Path & Sidewalk Details
M-4 (2024) - Bike Rack Layout Details
M-5 (2020) - Wood Rail Fence
M-6 (2024) - Patterned Hot-Mix or Concrete & Brick Paver Details
M-7 (2022) - Chain Link Fence Details
M-8 (2014) - PCC Parking Bumper
M-9 - Bus Stop Pad Details
M-9 (2026) - 1 - Bus Stop Details, Types 1, 2, & 3 M-9 (2021) - 2 - Bus Stop Pad with Shelter Details, Types 1 & 2
M-10 - Bridge Safety Fence
M-10 (2026) - 1 - TL-4 Exterior Bridge Safety Fence, Layout M-10 (2016) - 2 - TL-4 Exterior Bridge Safety Fence, Components M-10 (2026) - 3 - TL-3 Exterior Bridge Safety Fence M-10 (2026) - 4 - Non-Crashworthy Exterior Bridge Safety Fence, Layout M-10 (2026) - 5 - Non-Crashworthy Exterior Bridge Safety Fence, Components
M-11 - Steel plate
M-11 (2021) - 1 - Steel Plate - Roadway M-11 (2021) - 2 - Steel Plate - Bridge Deck M-11 (2021) - 3 - Steel Plate - Bridge Deck
M-12 (2020) - Driveway Transverse Slope Grading
M-13 (2024) - Temporary Pedestrian Pathway
M-14 (2024) - Pinned to Unpinned Temporary PCC Safety Barrier Connection
M-15 (2026) - Temporary Traffic Control - Storage of Equipment
M-16 (2026) - Vertical Difference Treatment Requirements
M-17 (2026) - Triangular Channelizing Islands & Tubular Markers
Section VII - Pavement
P-1 - PCC Pavement
P-1 (2024) - 1 - Slab Plan (With Dowel and Tie Locations)
P-1 (2024) - 2 - Joint and Sealant
P-1 (2024) - 3 - W Bolt, Hook Bolt, Dowel and Tie Bar
P-1 (2024) - 4 - Dowel and Tie Bar Placement tolerance
P-2 - PCC Pavement Patching
P-2 (2024) - 1 - Full Depth Patch Plan Views
P-2 (2024) - 2 - Full Depth Patch, Section Views
P-2 (2024) - 3 - Longitudinal Construction Joint Details
P-2 (2024) - 4 - Full Depth Patch, Sealant, Grout Retention Disk and Dowel Bars
P-2 (2024) - 4 - Full Depth Patch, Dowel Bar Placement Tolerance
P-2 (2024) - 6 - Partial Depth Patch, Plan and Section Views
P-3 (2024) - Butt Joints
P-4 (2024) - Permanent Cross-Road Patch Over Pipe Trench
P-5 - Rumble Strips
P-5 (2026) - 1 - Shoulder Rumble Strips on Interstates / Freeways / Expressways
P-5 (2026) - 2 - Sinusoidal Shoulder Rumble Strips on Multi-Lane Conventional Roadways
P-5 (2026) - 3 - Sinusoidal Shoulder Rumble Strips on Two-Way Roadways
P-5 (2026) - 4 - Sinusoidal Centerline Rumble Stripes
P-6 (2021) - Pavement Safety Edge
P-7 (2026) - Speed Hump
P-8 (2024) - Dowel Support Basket
Section VIII - Traffic
T-1 - Conduit Junction Wells
T-2 (2024) - Junction Well, Grounding & Bonding for Steel Frames and Lids
T-3 (2026) - Standard Lighting Cabinet, Types M and P
T-4 - Cabinet Bases
T-4 (2024) - 1 - Types M, K, & F
T-4 (2025) - 2 - Types P & R
T-5 - Pole Bases
T-5 (2025) - 1 - Round Base & Round Base With Square Foundation Header and Pole Base Chart
T-5 (2024) - 2 - Typical Section and Installation (Bases 1, 2, 2A, 2B, 3, 3A, and 3B)
T-5 (2026) - 3 - Typical Section (Base 6)
T-5 (2026) - 4 - Typical Section (Base 6B)
T-5 (2024) - 5 - Typical Section (Base 4A and 4B) and Anchor and Breakaway Coupling
T-6 - RESERVED
T-7 - RESERVED
T-8 - Loop Detector Lead-In Wire Installation
T-8 (2026) - 1 - Junction Well Behind Curb Or Curb and Gutter With Grass Strip
T-8 (2024) - 2 - Junction Well Behind Curb Or Curb and Gutter With Or Without Sidewalk
T-8 (2020) - 3 - Junction Well In Concrete Island
T-8 (2024) - 4 - Junction Well Without Curb and Gutter With Sidewalk and Grass Strips and Directly Adjacent to Paved Surface
T-9 - Loop Detector Installation
T-9 (2024) - 1 - Loop Detector Sawcut Typical, Hot-Mix Surface Section, and Splice Kit
T-9 (2020) - 2 - Typical Intersection Layout
T-9 (2020) - 3 - Pedestrian Crossing Typical Layout
T-9 (2024) - 4 - Wiring Color Codes
T-10 - RESERVED
T-11 - Messenger Wire Attachment
T-11 (2020) - 1 - Intermediate Messenger Wire Attachment On Wood Poles
T-11 (2020) - 2 - Angular Intermediate Messenger Wire Attachment
T-12 - Messenger Wire Attachment
T-12 (2020) - 1 - Attachment Between Poles
T-12 (2020) - 2 - Dead End Messenger Wire Attachment
T-12 (2026) - 3 - Span Wire Assembly
T-13 - RESERVED
T-14 - Emergency Preemption Receiver
T-14 (2024) - 1 - Upright Mount
T-14 (2024) - 2 - Inverted Mount
T-15 (2024) - Breakaway Sign Post and Pin Assembly Details
T-16 (2025) - Permanent Wood Barricade
T-17 - Electrical Service Pedestal - Lighting, Signal & 'ITMS' Component Installations
T-17 (2025) - 1 - 100 Amp (3+ Devices)
T-17 (2024) - 2 - 100 Amp (Condensed)
T-17 (2024) - 3 - 100 Amp (Up to 2 Devices)
T-17 (2024) - 4 - 200 Amp - Standard Lighting Component Installations
T-17 (2026) - 5 - Lighting Component Installations (12 Or Less Fixtures) - 60 AMP
T-17 (2026) - 6 - Electrical service pedestal – signal & ITS component installations sign assemblies with flashing beacons – 100 AMP
T-17 (2024) - 7 - Electrical service pedestal – signal & ITS component installations sign assemblies with flashing beacons – 100 AMP (condensed)
T-18 - Pedestrian Pushbutton Location
T-18 (2022) - 1 - Pushbutton Assembly Location On Pole
T-18 (2022) - 2 - Sign Attachment
T-18 (2025) - 3 - Pedestrian Pushbutton location – AC-powered RRFB signal pole installation
T-19 - Barrier Mounted Sign
T-19 (2026) - 1 - Barrier Mounted Sign
T-19 (2024) - 2 - Barrier Mounted Sign
T-19 (2025) - 3 - Mile Marker Barrier Mount
T-20 - Breakaway Steel Sign Support Charts
T-20 (2026) - 1 - Breakaway Steel Sign Support Charts
T-20 (2026) - 2 - Breakaway Steel Sign Support Charts
T-21 (2025) - Sign Installation Date Decal
T-22 (2022) - Extruded Aluminum Details Vertical Support Attachment
T-23 - Breakaway Steel Sign Support Foundations
T-23 (2026) - 1 - Breakaway Steel Sign Support Foundations
T-23 (2026) - 2 - Breakaway Steel Sign Support Foundations
T-24 (2024) - Galvanized Steel Beam Sign Posts Vertical and Lateral Clearance
T-25 (2024) - Galvanized Steel Beam Sign Posts Service Panel Attachments Details
T-26 - Extruded Aluminum Detail
T-26 (2024) - 1 - Extruded Aluminum Detail
T-26 (2024) - 2 - Extruded Aluminum Detail