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IRC SP 49 : 2014Guidelines on Use of Geosynthetics in Highway Engineering

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AASHTO M 288

CurrentFrequently UsedCode of PracticeTransportation · Roads and Pavement

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IRC SP 49:2014 is the Indian Standard (IRC) for guidelines on use of geosynthetics in highway engineering. IRC SP:49 covers geosynthetics in highway construction — geotextiles for separation/filtration, geogrids for reinforcement, geocells for slope protection, and geomembranes for waterproofing. Increasingly used to build roads on soft soil and improve pavement performance.

Guidelines for application of geotextiles, geogrids, geocells, and geomembranes in highway construction for separation, reinforcement, drainage, and erosion control.

Quick Reference — IRC SP 49:2014 Geosynthetics in Highways

Key reference values — verify against the current code edition / project specification.

✓ Verified 2026-05-15

Reference	Value	Clause
Functions	Separation / reinforcement / drainage / filtration / erosion	Scope
Products	Geotextile, geogrid, geocell, geomembrane	Types
Separation	Subgrade–subbase intermixing prevented	Use
Reinforcement	Subgrade/base reinforcement, reduced thickness	Use
Design	Survivability + function-specific properties	Design
Read with	IRC 113 / IS 16391-series (geosynthetics)	Cross-ref

⚠ Indicative reference values from the code/standard practice; binding figures are those in the current edition and the project specification.

Overview

Status: Current
Usage level: Frequently Used
Domain: Transportation — Roads and Pavement
Type: Code of Practice

International equivalents

AASHTO M 288 · AASHTO (US)

Typically used with

IRC 37 IS 14207

Also on InfraLens for IRC SP 49

23Key values 9Tables 13FAQs

Practical Notes

! Geotextile separation between subgrade (CBR <3%) and granular layer prevents mixing — saves aggregate.

! Geogrids in granular base reduce thickness by 30-40% — cost-effective for roads on weak subgrade.

! Quality of geosynthetic installation is critical — overlaps, anchoring, and protection from UV.

! Always verify the site-specific soil conditions (gradation, plasticity, moisture content) before selecting geosynthetic properties for separation. Don't just rely on general recommendations.

! For subgrade reinforcement under heavy traffic loads (e.g., NHAI projects), ensure adequate embedment of geogrids and consider staged construction to avoid premature failure.

! When using geotextiles for drainage, ensure the permittivity and flow rate are sufficient to handle anticipated groundwater inflow. A plugged geotextile is worse than no geotextile.

! Geocells are excellent for load distribution on weak subgrades, but proper compaction of the fill material within the cells is crucial. Varying fill levels can lead to uneven settlement.

! For erosion control, the choice of geosynthetic depends on the flow velocity of water and the erodibility of the soil. Consider higher strength, interlocking products for steeper slopes.

! Geomembranes for liners require meticulous joint welding. Always perform field seam tests and have a robust QA/QC plan in place.

! During installation, protect geosynthetics from sharp objects, excessive foot traffic, and UV exposure. Cover them as soon as practically possible.

! Soil type significantly influences the effectiveness of geosynthetic reinforcement. A well-graded granular material is ideal for filling geocells and for sub-base/base courses.

! For PMGSY roads where materials may be variable, geosynthetics can be a cost-effective way to achieve design strength with less ideal borrow materials.

! Always consider the long-term performance and durability of the geosynthetic material. Factors like UV degradation, chemical attack, and biological degradation must be assessed.

! The interface friction angle between the geosynthetic and soil is critical for reinforcement applications. Ensure compatibility or use interlayers if necessary.

! When specifying geotextiles, look beyond just tensile strength. Apparent Opening Size (AOS) and Permittivity are equally important for separation and drainage functions respectively.

! Carry out a visual inspection of the installed geosynthetics before backfilling to detect any damage or misplacement. This is a critical QA step.

! In situations with expansive clays, consider the potential for increased pore water pressure and select geosynthetics accordingly, particularly for drainage layers.

! The installation temperature can affect the handling and performance of some geosynthetic materials, especially geomembranes. Follow manufacturer recommendations.

! For bridge abutment slopes, geosynthetic reinforcement can significantly reduce settlement and improve stability, allowing for steeper slopes and reduced backfill volumes.

Frequently referenced clauses

Cl. 3 — Types of geosynthetics and functions

Cl. 4 — Separation application (between subgrade and granular layer)

Cl. 5 — Reinforcement (embankments on soft soil, steep slopes)

Cl. 6 — Drainage (geocomposite drains)

Cl. 7 — Erosion control (geotextile wraps, turf reinforcement)

Cl. 3.1 — Scope of the guidelines

Cl. 4 — Materials: Geotextiles, Geogrids, Geocells, Geomembranes

Cl. 5 — Functions of Geosynthetics: Separation, Reinforcement, Filtration, Drainage, Erosion Control, Barrier

Cl. 6 — Design Considerations for Separation

Cl. 7 — Design Considerations for Reinforcement

Cl. 8 — Design Considerations for Drainage

Cl. 9 — Design Considerations for Erosion Control

Cl. 10 — Installation Procedures

geosyntheticsgeotextilegeogridgeocellroad reinforcementsoil reinforcementIRC SP

Engineer's Notes

In Practice — Editorial Commentary

When IRC SP 49 is your governing code

IRC SP 49 (2014) provides Guidelines on Use of Geosynthetics in Highway Engineering — the IRC's standard for geotextiles, geogrids, geomembranes, geocomposites + erosion-control matting in highway projects. Geosynthetics have transformed soft-soil construction, reinforced earth, drainage, separation + filtration applications.

Use IRC SP 49 when you are: - Designing road over soft / waterlogged ground with geosynthetic reinforcement - Specifying separation + filtration with geotextile between soil + granular layers - Designing reinforced soil walls (RE walls) - Specifying drainage applications (French drains, behind retaining walls) - Specifying erosion control on slopes + drains - Using geomembrane for waterproofing applications - Doing PMGSY construction in difficult soils

Geosynthetic types:

1. Geotextile (woven / non-woven): fabric; separation, filtration, drainage 2. Geogrid: open mesh; reinforcement (RE walls, embankments) 3. Geocell: 3D cellular structure; reinforcement, erosion control 4. Geomembrane: impermeable sheet; waterproofing 5. Geocomposite: combination (e.g., geotextile + geomembrane) 6. Erosion-control matting: for slope vegetation

Applications: - Reinforced soil walls (replace heavy retaining structures) - Reinforced embankments (soft soil + steepened slope) - Subgrade improvement (separation between sub-soil + granular sub-base) - French drains (filter wrap around pipe) - Erosion control (slope vegetation matrix) - Waterproofing (between layers) - Landfill liner (separate context)

Key advantages over conventional methods: - Cost-effective (often 30-50 % cheaper than masonry / RCC) - Faster construction - Lower environmental impact (less mining + concrete) - Adaptable to site geology

Geosynthetic selection + design

Application-specific selection:

1. Reinforced Soil Walls (RE Walls): - Geogrid: uniaxial or biaxial; reinforces fill behind face - Tensile strength: 20-100 kN/m typical - Length: 0.7 × wall height + 3 m minimum - Spacing vertical: 400-600 mm - Wall height: typically 4-15 m; > 15 m with detailed analysis - Connection to wall face: mechanical or wrap-back

2. Subgrade Separation: - Geotextile (woven or non-woven): - AOS (Apparent Opening Size): 0.075-0.250 mm (matches sub-soil grain size) - Permittivity: ≥ 0.1 sec⁻¹ - Mass: 130-300 g/m² - Function: prevent fine soil migration into granular sub-base

3. French Drain / Drainage Application: - Geotextile non-woven: - AOS: 0.075-0.150 mm - Permittivity: ≥ 0.5 sec⁻¹ - Function: filter; allows water in, prevents fine migration - Installation: wraps perforated pipe + granular envelope

4. Reinforced Embankment (Soft Foundation): - Geogrid or woven geotextile: - Tensile strength: 50-200 kN/m - Layer separation: 0.5-1.0 m vertically - Function: distributes load over soft sub-soil - Allows higher embankment without bearing failure

5. Slope Erosion Control: - Erosion control mat (ECM): coir, jute, or polymer mesh - Function: allows vegetation establishment; prevents soil erosion - Material: biodegradable or permanent - Service life: 3-7 years (biodegradable; vegetation takes over)

6. Geocell Reinforcement: - 3D cellular polymer structure filled with soil / aggregate - Function: reinforces granular base; confines + distributes load - Application: soft subgrade improvement, parking areas, low-traffic roads

Design considerations: - Tensile strength based on application loads + safety factor - Creep behavior: geosynthetics deform over time under sustained load (more than steel); design with creep reduction factor (0.4-0.7 of ultimate) - Durability + UV resistance: sun + moisture exposure during placement - Connection details: at wall face or other interfaces - Construction quality: adequate cover before traffic

Reference values + specifications

Geogrid (reinforcement): - Tensile strength (LTDS = long-term design strength): - Polymer (HDPE, PP): 20-200 kN/m - Steel-mesh + polymer coated: up to 500 kN/m - Long-term reduction factors: - Creep: 0.7-1.0 (varies by polymer + load duration) - Installation damage: 0.85-0.95 - Durability: 0.85-0.95 - Connection: 0.85-1.0 - Mesh dimensions: typical 200-500 mm aperture - Color: UV-protected (black or dark)

Geotextile (separation + filtration): - Mass: 130-500 g/m² - AOS: matches sub-soil grain size; typically 0.075-0.250 mm - Permittivity: ≥ 0.1-0.5 sec⁻¹ - Tensile strength: 5-25 kN/m - Elongation: 25-65 % at failure - Material: polyester (PET), polypropylene (PP), polyethylene (PE)

Geomembrane (waterproofing): - Thickness: 1.0-2.5 mm typical - Material: HDPE, LLDPE, PVC, EPDM - Permeability: < 1 × 10⁻¹¹ cm/s (effectively impermeable) - Tensile strength: ≥ 25-35 kN/m - Elongation: > 700 % - UV resistance: UV-stabilised

Geocell (3D reinforcement): - Cell height: 75-200 mm - Cell dimensions: 100 × 100 mm to 200 × 200 mm - Material: HDPE or polypropylene - Wall thickness: 1.0-1.6 mm

Erosion control mat: - Biodegradable (coir / jute): 100-200 g/m²; 3-5 year life - Permanent (HDPE / PP): 100-300 g/m²; permanent - Reinforcement matting (TRM): for high-flow channels

Construction: - Storage: dry, UV-protected, off-ground - Transport: rolls; handle gently - Placement: flat, no folds, free of debris - Overlap: 300-500 mm at seams (for non-woven); 150 mm minimum for woven - Anchorage: trench-anchor at top + sides; 0.3-0.5 m deep - Cover: granular cover 150-300 mm before traffic - Quality control: dimensional + visual + sampling for lab testing

Quality control + testing: - Sampling: 1 sample per 1000 m² + 1 per shipment - Lab testing: mass, AOS, tensile strength, permittivity - Site inspection: placement quality, overlap, anchorage, damage - Acceptance: material per specification + visual quality

Service life: - Polymer geosynthetic (HDPE, PP): 50-100 years under cover - Polyester: 80+ years - Coir / jute biodegradable: 3-7 years (intended) - Geomembrane (HDPE): 50-100 years

Cost-effectiveness: - Geosynthetic reinforcement: 30-50 % cost saving vs RCC wall - Geotextile separation: 10-20 % cost saving on subgrade improvement - Erosion control: 50-70 % cost saving vs masonry

Companion codes (must pair with)

IRC:75:2015 — High Embankments. Reinforced earth applications.
IRC:36:2010 — Earth Embankment Construction.
IRC:34:2011 — Construction in Waterlogged Areas.
IRC:52:2019 — Hill Roads. Slope reinforcement + erosion control.
IRC:SP-48:1998 — Hill Road Manual. Slope stability.
IRC:SP-89:2018 — Soil + Granular Stabilisation. Alternative subgrade improvement.
IRC:SP-58:2015 — Fly Ash in Embankments. Alternative.
IRC:SP-42:2014 — Road Drainage. Geotextile in drainage applications.
IRC:SP-50:2013 — Urban Drainage.
IRC:78:2014 — Bridge Foundations. RE walls at abutments.
IS 15351 — Geotextile.
IS 13986 — Geotextile Specifications.
IS 14986 — Geotextile Testing.
IS 15642 — Geogrid for soil reinforcement.
IS 14292 — Geosynthetic Clay Liner.
ASTM D 4595 — Tensile Strength of Geotextile.
ASTM D 4632 — Grab Tensile Strength.
ASTM D 4751 — AOS.
ASTM D 4491 — Permittivity.
ISO 10319 — Geosynthetic Tensile Strength.
FHWA-NHI-10-024 — Geosynthetic Design + Construction Guidelines.
IGS (International Geosynthetic Society) Standards.
MoRTH Specifications for Road and Bridge Works — Section 600 (Pavement) + Section 700 (Bridges).

Common pitfalls / what reviewers flag

1. Wrong geosynthetic for application. Geotextile used for reinforcement (low tensile); failure. Match application. 2. AOS / permittivity wrong. Filter doesn't work; soil migrates / drainage clogs. Match to soil + design. 3. No overlap at seams. Soil migrates through gaps. 300-500 mm overlap mandatory. 4. UV degradation during storage. Material weakened before installation. Store properly; install promptly. 5. Insufficient cover. Geosynthetic damaged by traffic before granular cover placed. Minimum 150-300 mm granular cover. 6. No anchorage. Wind / construction movement pulls material out. Trench-anchor mandatory. 7. Construction damage. Equipment tears geogrid; tensile failure point. Careful equipment + spotters. 8. Connection to wall face inadequate. RE wall reinforcement pulls out at face. Mechanical or wrap-back connection. 9. Creep / long-term loading ignored. Tensile strength assumed = ultimate; creep reduces over time. LTDS not ultimate. 10. No quality control. Material below specification; performance below design. Per-shipment QC + sampling. 11. Wet conditions. Material wet during installation; bonding compromised. Dry weather installation. 12. No design for connection details. At wall face, drainage, corners. Detail design at all interfaces. 13. Cost-cutting on quality. Cheap import without certification; field failures. Manufacturer qualification + acceptance testing. 14. No long-term monitoring. Performance over 25-50 years uncertain. Periodic inspection of RE walls + monitoring. 15. Inadequate filter behind retaining wall. Hydrostatic pressure builds; wall failure. Proper filter design. 16. Erosion mat without vegetation establishment. Bare mat doesn't protect long-term. Hydroseeding + maintenance plan. 17. Conflicting standards. Multiple ASTM / ISO / IS standards; consistency lost. Stick to one comprehensive standard set.

Where it sits in geotechnical-engineering lifecycle

Geosynthetics project — IRC SP 49 touchpoints:

1. Concept / design: - Identify application - Geosynthetic type selection (geogrid / geotextile / geomembrane) - Design parameters (tensile strength, AOS, etc.) - Connection + boundary details

2. Material selection: - Specification per application - Supplier evaluation - Sample testing pre-procurement

3. Procurement + storage: - Per specification - Sample acceptance testing - Proper storage (dry, UV-protected, off-ground) - Handling protocol

4. Installation: - Subgrade preparation - Geosynthetic placement - Overlap at seams - Anchorage - Inspection before cover - Granular cover placement - Sequential construction per design

5. Quality control: - Per-shipment sample testing - Visual inspection during installation - Damage assessment - Acceptance per specification

6. Post-construction: - As-built documentation - Visual inspection during defects-liability - Long-term monitoring (RE walls, critical applications) - Performance assessment

7. Long-term: - 5-year inspection for critical structures - Drainage clog monitoring - Erosion control vegetation health - 25-50+ year service life with maintenance

IRC SP 49 is the modern geosynthetics reference for India — applied on RE walls, soft-soil road construction, drainage applications, erosion control, and increasingly on PMGSY + NHAI projects. Cost-effective + environmentally-friendly alternative to traditional methods.

International Equivalents

Similar International Standards

AASHTO M 288AASHTO (US)

HighCurrent

Geotextile Specification for Highway Applications

Both cover geosynthetic applications in highway engineering with similar property requirements.

Key Differences

Key Similarities

≈Both cover separation, reinforcement, drainage, and erosion control applications of geosynthetics in roads.

Parameter Comparison

Parameter	IS Value	International	Source

⚠ Verify details from original standards before use

Key Values23

Quick Reference Values

Separation geotextileMin 200 g/m², CBR puncture >2000N

Reinforcement geogridTensile strength 30-200 kN/m

Geocell height75-200mm for road applications

Minimum tensile strength of geotextile for separation in sub-base/subgrade20 kN/m

Minimum tensile strength of geotextile for separation in base course30 kN/m

Minimum tensile strength of geotextile for reinforcement in sub-base40 kN/m

Minimum tensile strength of geotextile for reinforcement in base course50 kN/m

Maximum apparent opening size (AOS) for separation in subgrade (fine-grained soils)0.10 mm

Maximum apparent opening size (AOS) for separation in subgrade (coarse-grained soils)0.20 mm

Permittivity of geotextile for drainage0.5 sec⁻¹

Flow rate of geotextile for drainage200 L/m²/min

Minimum junction strength for geogrids10 kN/m

Typical CBR improvement factor for geogrid reinforcement in sub-base2.0 to 3.0

Minimum elongation at break for geotextile in separation10%

Maximum creep strain for geogrids under sustained load2%

Recommended thickness of geomembrane for landfill liners1.0 mm

Typical protection layer thickness for geomembranes300 mm

Maximum UV exposure limit for UV-stabilized geosynthetics1000 kLy

Minimum installation temperature for geosynthetics5°C

Recommended factor of safety for reinforcement applications1.5

Minimum overlap for woven geotextiles300 mm

Minimum overlap for non-woven geotextiles500 mm

Typical void ratio for geocell filled with granular material0.35 to 0.45

Key Formulas

Tensile Strength (Ts) = Product of tensile strength at peak and durability factor

Factor of Safety (FS) = Ultimate tensile strength / Design tensile stress

CBR Improvement Factor = CBR_reinforced / CBR_unreinforced

Permittivity (Ψ) = Flow rate / (Permeability * Thickness)

Apparent Opening Size (AOS) = Characteristic opening size determined by sieving or direct measurement

Net Tensile Force (Ntf) = Ultimate Tensile Strength / Factor of Safety

Tables & Referenced Sections

Key Tables

Table 1 — Geosynthetic selection by application

Table 2 — Property requirements for separation

Table 3 — Design methodology for reinforcement

Table 1 — Typical Applications of Geosynthetics in Highway Engineering

Table 2 — Geotextile Properties for Separation

Table 3 — Geotextile Properties for Reinforcement

Table 4 — Geogrid Properties for Reinforcement

Table 5 — Geocell Applications and Fill Materials

Table 6 — Geomembrane Properties and Applications

Frequently Asked Questions13

When to use geosynthetics in roads?+

Separation: subgrade CBR <5% (prevents granular material mixing into soft soil). Reinforcement: embankments on soft soil, steep slopes >1V:2H. Drainage: behind retaining walls, at pavement edges. Erosion control: slopes, embankment faces, channel lining.

What is the primary role of geosynthetics in highway subgrade stabilization?+

Geosynthetics, primarily geogrids and geotextiles, are used for subgrade stabilization to improve load-bearing capacity, reduce differential settlement, and increase the overall stiffness of the pavement structure. They achieve this by reinforcing the granular base or sub-base layers, effectively distributing traffic loads over a wider area and preventing the mixing of base material with the weaker subgrade, thus preventing pumping and rutting.

How do I choose between a woven and non-woven geotextile for a separation application?+

The choice depends on the soil types and the specific function. Woven geotextiles generally have higher tensile strength and lower elongation, making them suitable for reinforcement or separation in high-stress areas. Non-woven geotextiles offer better filtration and drainage properties due to their random fiber structure and are often preferred for separation where water management is crucial, like between subgrade and sub-base.

What are the key design considerations for using geogrids for reinforcement?+

For geogrid reinforcement, key considerations include the ultimate tensile strength of the geogrid, its junction strength, elongation at break, and creep resistance. The design must account for the type of soil, the required load-bearing capacity, the desired factor of safety, and the interaction between the geogrid and the soil (interface friction). Durability against UV exposure and chemical attack is also vital for long-term performance.

Can geosynthetics be used in conjunction with other pavement materials?+

Yes, geosynthetics are often used in conjunction with traditional pavement materials. They can be placed between the subgrade and sub-base, between sub-base and base course, or within the base course itself. They also complement drainage systems by providing filtration and preventing fine particle migration. Their use is designed to enhance the performance and longevity of the overall pavement structure.

What is apparent opening size (AOS) and why is it important for separation?+

Apparent Opening Size (AOS) is a measure of the largest particle that can pass through the openings of a geotextile. For separation, it's crucial that the AOS is small enough to prevent the fines from the finer soil layer (e.g., subgrade) from migrating into the coarser material (e.g., sub-base), while still allowing water to pass. This prevents clogging and maintains the integrity of both layers.

How does the IRC SP 49:2014 address erosion control using geosynthetics?+

IRC SP 49:2014 provides guidelines on using geosynthetics for erosion control, particularly for slopes and channels. It recommends specific types of geotextiles and geocells that can stabilize soil surfaces, reduce the impact of rainfall and runoff, and promote vegetation growth. These materials create a protective layer that anchors the soil and withstands erosive forces.

What is the role of geosynthetics in improving the CBR value of a soil layer?+

Geogrids and certain high-strength geotextiles, when placed within or below a granular layer, can significantly improve its effective CBR value. This reinforcement effect is due to the confinement provided by the geosynthetic, which limits lateral spreading of the granular material under load and increases the overall stiffness and load-carrying capacity of the layer. This allows for thinner pavement structures or the use of lower quality granular materials.

What are the common installation challenges with geosynthetics, and how are they addressed?+

Common installation challenges include damage from sharp objects, improper overlap, wind uplift during placement, and incorrect orientation. IRC SP 49:2014 emphasizes meticulous site preparation, careful handling, adequate overlap, secure anchoring of geosynthetics, and prompt covering with soil or aggregate. Site supervision and quality control are essential to mitigate these issues.

What is the purpose of geomembranes in highway engineering as per this code?+

While primarily used in hydraulic structures, geomembranes are mentioned for barrier applications in highway engineering, such as lining leachate collection systems for waste containment areas adjacent to roads or for lining canals and reservoirs. Their key function is to provide a low-permeability barrier against the movement of liquids or gases, preventing contamination or loss of water.

How does the code specify the durability requirements for geosynthetics?+

The code emphasizes the need for geosynthetics to be durable under the expected service conditions. This includes resistance to UV degradation, chemical attack from soil and groundwater, biological degradation, and mechanical damage during installation and service life. Manufacturers typically provide data on the expected service life under various environmental exposures.

What are geocells and how are they used in pavement construction?+

Geocells are three-dimensional honeycomb-like structures made from geosynthetic materials. In pavement construction, they are filled with granular material (e.g., aggregate, sand) and then compacted. This creates a stiffened mattress that effectively distributes loads, reduces rutting, and enhances the bearing capacity of weak subgrades. They are particularly useful in areas with limited access or challenging soil conditions.

What are the critical parameters for geotextiles used in drainage applications?+

For drainage, the critical parameters of a geotextile are its permittivity and flow rate. Permittivity is the ability of water to pass through the geotextile in the normal direction, while flow rate indicates the volume of water that can pass per unit area per unit time. These properties ensure efficient removal of pore water pressure, preventing instability and damage to the pavement structure.

QA/QC Inspection Templates

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QA/QC templates coming soon for this code.

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BOQ Builder·Auto-BOQ from dimensions, DSR ratesNEW→BidEasy·Government tenders, searchableLIVE→InfraLens App·Free on Play Store, offline-readyNEW→

IRC SP 49 : 2014Guidelines on Use of Geosynthetics in Highway Engineering

PDF Google Compare IRC Portal

Link points to Internet Archive / others. Not hosted by InfraLens. Details

AASHTO M 288

CurrentFrequently UsedCode of PracticeTransportation · Roads and Pavement

PDF Google Compare IRC Portal

Link points to Internet Archive / others. Not hosted by InfraLens. Details

Guidelines for application of geotextiles, geogrids, geocells, and geomembranes in highway construction for separation, reinforcement, drainage, and erosion control.

Quick Reference — IRC SP 49:2014 Geosynthetics in Highways

Key reference values — verify against the current code edition / project specification.

✓ Verified 2026-05-15

Reference	Value	Clause
Functions	Separation / reinforcement / drainage / filtration / erosion	Scope
Products	Geotextile, geogrid, geocell, geomembrane	Types
Separation	Subgrade–subbase intermixing prevented	Use
Reinforcement	Subgrade/base reinforcement, reduced thickness	Use
Design	Survivability + function-specific properties	Design
Read with	IRC 113 / IS 16391-series (geosynthetics)	Cross-ref

⚠ Indicative reference values from the code/standard practice; binding figures are those in the current edition and the project specification.

Overview

Status: Current
Usage level: Frequently Used
Domain: Transportation — Roads and Pavement
Type: Code of Practice