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IRC SP 87 : 2013Manual of Specifications and Standards for Four Laning of Highways

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AASHTO A Policy on Geometric Design of Highways and Streets (Green Book) · Austroads Guide to Pavement Technology · Design Manual for Roads and Bridges (DMRB) - UK Highways Agency

CurrentFrequently UsedCode of PracticeTransportation · Roads and Pavement

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IRC SP 87:2013 is the Indian Standard (IRC) for manual of specifications and standards for four laning of highways. The Manual of Specifications and Standards for Four Laning of Highways serves as a definitive guide for engineers involved in the planning, design, and execution of four-lane highway projects in India. It details the critical parameters and requirements to ensure the construction of safe, efficient, and durable roadways capable of handling increased traffic volumes. The document emphasizes the importance of adherence to established standards for geometric features, material specifications, construction methodologies, and quality control measures. By providing a standardized framework, it aims to achieve uniformity in construction quality across projects and facilitate smooth traffic flow and enhanced road safety. Engineers must thoroughly understand its provisions to effectively manage four-lane highway development.

This manual provides comprehensive specifications and standards for the design, construction, and maintenance of four-lane highways. It covers various aspects of highway engineering, including geometric design, pavement design, drainage, traffic control devices, and environmental considerations specific to four-lane facilities.

Quick Reference — IRC SP 87:2013 Four-Laning Manual

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

✓ Verified 2026-05-15

Reference	Value	Clause
Subject	Specs & standards for 4-laning of highways	Scope
Cross-section	2×2 lanes + median + paved shoulders	Geometry
Design speed	By terrain (plain/rolling/hilly)	Geometry
Pavement	Flexible (IRC 37) / rigid (IRC 58)	Design
Use	NHAI/MoRTH 4-lane project standard	Application
Read with	IRC SP 73 (2-lane) / IRC SP 84	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 A Policy on Geometric Design of Highways and Streets (Green Book)Austroads Guide to Pavement Technology Design Manual for Roads and Bridges (DMRB) - UK Highways Agency

Typically used with

IS 73

Also on InfraLens for IRC SP 87

20Key values 6Tables 10FAQs

Practical Notes

! Ensure adequate provision for drainage to prevent waterlogging, which can significantly degrade pavement performance.

! Proper compaction of embankment and pavement layers is paramount for achieving design strength and durability. Field density tests are crucial.

! The transition from normal grade to superelevated curves must be designed carefully to avoid abrupt changes in cross-section, maintaining comfort and safety.

! Adequate sight distance should be maintained at intersections and at the crest of vertical curves to prevent accidents.

! Median landscaping should be designed to minimize headlight glare from oncoming traffic while providing a visual buffer.

! The selection of appropriate materials for sub-base and base courses, meeting specified gradation and strength requirements, is critical for pavement longevity.

! Regular maintenance, including crack sealing and resurfacing, is essential to preserve the integrity of the four-lane pavement and prevent deterioration.

! During construction, traffic diversion and management plans must be strictly adhered to, with clear signage and safety personnel.

! The design of culverts and bridges must account for adequate hydraulic capacity to handle design flood levels, preventing scour and structural damage.

! Noise barriers may be necessary in sensitive areas (e.g., near residential colonies) to mitigate noise pollution from high-speed traffic.

! Proper camber on the pavement surface is essential for effective surface drainage, especially in areas with high rainfall.

! The impact of construction activities on the environment must be minimized through the implementation of an effective Environmental Management Plan.

! Dowel bars and tie bars in rigid pavements need to be precisely placed and adequately lubricated to facilitate load transfer and joint movement.

! The design of intersections for four-lane highways requires special attention to provide sufficient turning radii and efficient traffic management, including grade separation where necessary.

! Specification for bituminous mixes should clearly define binder content, aggregate gradation, and compaction requirements to achieve desired performance.

Frequently referenced clauses

Cl. 1.1Introduction and Scope

Cl. 2.1Geometric Design - General Principles

Cl. 3.2Pavement Design - Flexible Pavements

Cl. 4.1Drainage Design - General Requirements

Cl. 5.3Construction of Embankments and Cuttings

Cl. 6.1Quality Control and Assurance

Cl. 7.2Traffic Management and Safety During Construction

Cl. 8.1Environment Management Plan

Four-LaningHighway DesignPavement EngineeringGeometric DesignTraffic SafetyConstruction StandardsIRC CodesIndian HighwaysRoad InfrastructureTransportation EngineeringIRC

Engineer's Notes

In Practice — Editorial Commentary

When IRC SP 87 is your governing code

IRC SP 87 (2013) is the Manual of Specifications and Standards for Four Laning of Highways — the comprehensive technical reference for NH 4-lane upgrade projects in India. It predates IRC:SP-84:2019 (which superseded it in 2019) but remains valid for projects already designed under SP 87 + as a reference manual for the 4-lane standard.

Use IRC SP 87 when you are: - Doing DPR for NH 4-laning under EPC / HAM / BOT contracts - Specifying technical standards for NH 4-lane construction - Cross-referencing NH project specifications - Doing review of older NH projects designed under SP 87 - Comparing SP 87 vs SP 84 standards for project documentation

What IRC SP 87 covers: - NH 4-lane geometric design (cross-section, alignment, junctions) - Pavement design (flexible + rigid options) - Bridge + culvert standards - Drainage system - Safety appurtenances (signage, markings, crash barriers) - Construction methodology + quality assurance - Special structures (flyovers, ROBs, RUBs) - Performance-based maintenance contracts - Tender + contract framework

SP 87 vs SP 84 (current): - SP 87 (2013): comprehensive manual; basis for many 2014-2019 NH projects - SP 84 (2019): updated; current standard for new NH 4-laning projects - Major updates: pavement design, sustainability, modern construction, environmental

For new projects: use IRC:SP-84:2019 For older / ongoing projects: SP 87 may still apply

NH 4-lane design framework

Cross-section (typical NH 4-lane): - Carriageway: 2 lanes × 7.0 m = 14.0 m total (each direction) - Median: 5.0 m (with crash barrier) - Shoulder (paved + earthen): 2.5 m each side (1.5 m paved + 1.0 m earthen) - Service road (where required): 5.5-7.0 m wide - Total formation width: 24-30 m + service roads where applicable - ROW (Right of Way): typically 45-60 m

Geometric design (per IRC:73:1980 + IRC SP 87): - Design speed: - Plain terrain: 100-120 km/h ruling; 80-100 minimum - Rolling terrain: 80 km/h ruling; 65 km/h minimum - Mountainous: 50 km/h ruling; 40 km/h minimum - Horizontal curves per IRC:38:1988: - Plain terrain V=100 km/h: R = 360 m ruling, 240 m absolute - Plain terrain V=120 km/h: R = 510 m ruling, 360 m absolute - Vertical curves per IRC:SP-23:1993 - Super-elevation max: 7 % (plain/rolling); 10 % (mountainous)

Pavement design (per IRC:37:2018): - Cumulative ESAL design: 15-20 year horizon; 100-300+ msa typical - Layer system (flexible): - Subgrade (CBR ≥ 8 %) - Granular sub-base + stabilised - DBM + DBM (or DBC) per IRC:29:2019 - BC wearing per IRC:107:2013 - Total bituminous: typically 200-280 mm - Alternative rigid (CRCP/JCP): per IRC:58:2015 / IRC:SP-71:2018

Junctions + intersections: - Grade-separated structures at major junctions per IRC:SP-21:2009 - At-grade intersections at minor junctions; per IRC:65:2017 (rotaries) or signalised - Service roads for local access; minimise main-NH conflict

Drainage (per IRC:SP-42:2014 + IRC:SP-50:2013): - Cross-fall + edge drainage - Median drainage - Cross-drainage culverts - Subsurface drainage (French drains) - Bridge + flyover drainage

Safety appurtenances: - Crash barriers: in median + at hazard locations - Signage per IRC:67:2012 - Markings per IRC:35:2015 - Lighting at high-conflict locations - Speed-zone enforcement

Reference values + standards

Carriageway specifications: - Width per lane: 3.5 m - Total per direction (2-lane): 7.0 m - Median: 5.0 m typical - Shoulder (paved + earthen): 2.5 m + 1.0 m earthen = 3.5 m total each side

Pavement design parameters: - Cumulative ESAL (15-20 year): 100-300 msa typical - Asphalt thickness: 200-280 mm (flexible) - Concrete thickness: 250-300 mm (rigid) - Asphalt grade: VG-30 + modified for premium - Concrete grade: M40 minimum

Geometric design: - Design speed: 100-120 km/h for ruling alignment (plain/rolling) - Sight distances: - SSD: per IRC 66 - OSD: per IRC 66 - ISD: at intersections - Horizontal curves: R per IRC:38:1988 - Super-elevation: max 7 % (plain), 10 % (hill) - Vertical curves: SSD + OSD compatible

Drainage: - Cross-fall: 2.5 % from crown - Longitudinal drains: every 50-100 m - Cross-drainage: culverts at all natural drainage paths - Subsurface drainage: edge drains at cut sections + median

Safety: - Crash barriers: median + at hazard locations - Sight distance verified at every curve - Lighting: at intersections + service road approaches - Signage per IRC:67:2012 - Markings per IRC:35:2015

Bridge + structures: - Bridge cross-section: matches NH cross-section - Design vehicles: Class A + 70R per IRC:6:2017 - Pier + abutment design: per IRC:78:2014 + IRC:83:2018 - Bearings + joints per IRC:19:2005 + IRC:SP-77:2008

Construction tolerance: - Layer thickness: ± 5 mm (paving) - Surface evenness: 3 mm under 3-m straight-edge - Earthwork compaction: 95-97 % MDD - Reinforcement cover: ± 10 mm of design - Concrete strength: per design + acceptance

Quality control + acceptance: - Per IRC:SP-57:2015 - Inspection + test plan (ITP) per project - Material approval at supplier + site - Cube samples + density per pour - Surface verification per layer - Final pre-opening road safety audit

Companion codes (must pair with)

IRC:SP-84:2019 — Manual for 4-Laning (current; supersedes IRC SP 87).
IRC:SP-99:2013 — 6-Laning Manual.
IRC:73:1980 — Rural Highway Geometric Design.
IRC:38:1988 — Horizontal Curves.
IRC:37:2018 — Pavement Design.
IRC:29:2019 — DBM/DBC Specifications.
IRC:107:2013 — BC Wearing Course.
IRC:58:2015 — Rigid Pavement.
IRC:35:2015 — Road Markings.
IRC:67:2012 — Road Signs.
IRC:103:2012 — Pedestrian Facilities.
IRC:SP-21:2009 — Intersection + Grade Separated Structures.
IRC:65:2017 — Traffic Rotaries.
IRC:SP-42:2014 — Road Drainage.
IRC:SP-50:2013 — Urban Drainage.
IRC:5:2015 — Bridge General Features.
IRC:6:2017 — Bridge Loads + Stresses.
IRC:78:2014 — Bridge Foundations.
IRC:83:2018 — Direct Foundations.
IRC:112:2020 — Concrete Bridges.
IRC:24:2010 — Steel Bridges.
IRC:SP-19:2001 — Road DPR Manual.
IRC:SP-54:2000 — Bridge DPR Manual.
IRC:SP-57:2015 — Quality Systems for Bridges.
IRC:SP-44:1996 — Road Safety Audit.
IRC:SP-55:2014 — Work Zone Traffic Management.
IRC:SP-105:2015 — Smart City Streets.
IS 456:2000 — Plain + Reinforced Concrete.
IS 800:2007 — Steel Construction.
IS 1893 (Part 1) — Earthquake Resistant Design.
AASHTO LRFD Bridge Design Specifications.
NHAI Manual of Standards.
MoRTH Specifications for Road and Bridge Works.

Common pitfalls / what reviewers flag

1. Using SP 87 for new project where SP 84 applies. Specifications outdated; modern requirements not met. Use IRC:SP-84:2019 for new projects. 2. Cross-section under-spec. Lane width or shoulder reduced for cost; future capacity expansion difficult. Adhere to standard cross-section. 3. Pavement design from outdated VDF. ESAL calculation wrong; pavement under-designed. Use current VDF per IRC:37:2018. 4. Service road missing or inadequate. Main NH carries local traffic; safety + capacity issues. Service roads where needed. 5. Intersection geometry inadequate. Below standard; capacity + safety issues. Per IRC:SP-21:2009. 6. Bridge load class older. Pre-IRC 6:2017 used; modern MAVs over-load. Use current bridge load classes. 7. No road safety audit. In-service crashes high; signage / geometry issues. Per IRC:SP-44:1996. 8. Construction tolerance loose. Layer thickness ± 15 mm; surface evenness poor. Per IRC SP 87 + SP 57. 9. Drainage under-designed. Lower-return-period storm; underpass floods. Per IRC:SP-42:2014. 10. Crash barriers missing. Median + hazard zones unprotected; secondary crashes. Mandatory crash barriers. 11. Maintenance not budgeted. Long-term degradation; replacement surprise. Performance-based contracts with maintenance. 12. Environmental clearance delayed. Construction proceeds; clearance issues. Per IRC:SP-93:2017. 13. Land acquisition issues. Cost + time over-runs. Pre-DPR coordination. 14. No quality system. Per IRC:SP-57:2015 — comprehensive QA/QC. 15. No as-built records. Future maintenance + warranty issues. Comprehensive as-built drawings.

Where it sits in NH-project lifecycle

NH 4-laning project — IRC SP 87 touchpoints:

1. Pre-feasibility + feasibility: alignment, costing, environmental.

2. DPR (per IRC SP 87 + SP 19 / SP 54 framework): - Geotechnical + hydrological - Traffic study + design - Pavement design + cross-section - Bridge + culvert design - Drainage system - Safety appurtenances - Cost-benefit analysis - Environmental clearance

3. Tender + award: - Per NHAI EPC / HAM / BOT contracts - Technical + commercial bid - Award + agreement

4. Construction: - Earthwork + structural foundation - Pavement layers per IRC:37:2018 + IRC SP 87 - Bridge construction per IRC code - Surface work + safety appurtenances - Traffic management during construction

5. Quality control: per IRC:SP-57:2015 framework.

6. Pre-opening: - Road safety audit - Load testing of major bridges per IRC:SP-51:2015 - Commissioning

7. Operations + maintenance: - Performance-based contracts - Annual visual inspection - 5-year detailed pavement + bridge inspection - Long-term: 20-30 year design horizon

IRC SP 87 is the 2013 baseline NH 4-laning manual — applied on hundreds of NH projects through the mid-2010s. New projects now use IRC:SP-84:2019.

International Equivalents

Similar International Standards

AASHTO A Policy on Geometric Design of Highways and Streets (Green Book)

MediumCurrent

Austroads Guide to Pavement Technology

MediumCurrent

Design Manual for Roads and Bridges (DMRB) - UK Highways Agency

MediumCurrent

Key Differences

≠

Key Similarities

≈

Parameter Comparison

Parameter	IS Value	International	Source
Design Speed (Plain Terrain)
Minimum Median Width (Rural)
Minimum Overtaking Sight Distance (100 kmph)
Standard Lane Width
Minimum Subgrade CBR

⚠ Verify details from original standards before use

Key Values20

Quick Reference Values

minimum right of way width for four lane undivided highways25 m

minimum right of way width for four lane divided highways45 m

design speed for plain and rolling terrain100 kmph

design speed for mountainous and steep terrain60 kmph

median width for urban areas5 m (minimum)

shoulder width for national highways3.0 m (metalled)

kerb type in urban areasRaised kerb (typically 0.5m)

minimum camber for flexible pavements2.0%

minimum camber for rigid pavements1.5%

standard lane width3.5 m

minimum sight distance safe overtaking265 m (for 100 kmph)

maximum gradient in plain and rolling terrain3.3%

maximum gradient in mountainous and steep terrain6.0%

minimum radius of horizontal curve in plain terrain300 m

minimum radius of horizontal curve in mountainous terrain100 m

load bearing capacity of subgradeMinimum CBR 5%

standard construction joint spacing for dowel bars4.5 m

minimum thickness of wearing coat25 mm (asphaltic concrete)

minimum thickness of base course75 mm (crushed stone base)

minimum thickness of sub base course100 mm (WMM/GSB)

Key Formulas

Overtaking Sight Distance (OSD) = V_o * T_o + (V_o^2 - V_d^2) / (2 * a * g)

Stopping Sight Distance (SSD) = V * T + V^2 / (2 * g * f)

Radius of Horizontal Curve (R) = (V^2 / (127 * (e + f)))

Required Thickness of Pavement Layers (e.g., D = f(EAL, CBR))

Tables & Referenced Sections

Key Tables

Design Speed and Associated Sight Distances

Standard Pavement Layer Thicknesses for Flexible Pavements

Recommended Longitudinal Gradients

Median Width Recommendations

Shoulder Width and Type

Traffic Control Devices for Construction Zones

Frequently Asked Questions10

What are the key differences in design considerations for a four-lane divided highway versus a four-lane undivided highway?+

The primary difference lies in the provision of a median. A four-lane divided highway, as per IRC standards, mandates a median (with a minimum width of 5m in urban areas and 7.5m in rural areas) to physically separate opposing traffic flows. This enhances safety by preventing head-on collisions and allows for better traffic management and future widening. An undivided highway, on the other hand, lacks this separation, increasing the risk of head-on collisions and typically having stricter speed limits and design constraints to manage safety. The right-of-way requirements are also significantly larger for divided highways to accommodate the median and shoulders.

How does the IRC manual address the design of shoulders for four-lane highways?+

The IRC manual specifies the width and type of shoulders for four-lane highways based on the category of the road (e.g., National Highways, State Highways). For National Highways, a minimum metallid shoulder width of 3.0 meters is generally required. Shoulders serve crucial functions: they provide a safe space for stopped vehicles, act as an emergency lane for traffic, and provide lateral support to the pavement structure. The material and construction of the shoulder must ensure adequate load-bearing capacity and resistance to weathering.

What are the recommended design speeds for different terrains in this manual?+

The manual sets specific design speeds based on the terrain to ensure safe and efficient operation of vehicles. For plain and rolling terrain, the recommended design speed is typically 100 kmph. For mountainous and steep terrain, where geometric constraints are more significant, the design speed is reduced to 60 kmph. These design speeds directly influence critical geometric elements like sight distances, horizontal curves, and vertical gradients.

What are the critical drainage requirements for a four-lane highway as per the IRC code?+

Effective drainage is paramount for the longevity and safety of four-lane highways. The IRC manual emphasizes the need for adequate surface drainage through proper cambers and kerbs, ensuring rainwater is quickly channeled away from the pavement. Subsurface drainage is also addressed to prevent water ingress into the pavement layers, which can lead to material degradation. The design must account for rainfall intensity, runoff characteristics, and the capacity of roadside drains, culverts, and bridges to handle design flood levels.

How is the pavement thickness determined for a four-lane highway according to this manual?+

The pavement thickness for a four-lane highway is determined based on a detailed pavement design process outlined in the manual. This typically involves assessing the anticipated traffic volume (in terms of Equivalent Axle Loads or EAL) over the design life of the pavement and considering the strength of the subgrade (indicated by CBR value). The manual provides design charts, methods, and material specifications for both flexible (bituminous) and rigid (concrete) pavements, guiding engineers to select appropriate layer thicknesses and materials to withstand the projected traffic loads and environmental conditions.

What are the safety provisions mandated by the IRC for traffic management during the construction of four-lane highways?+

The IRC manual dedicates significant attention to safety during construction. It outlines requirements for traffic management plans, including proper diversion routes, signage, and temporary traffic control devices to guide vehicles safely through construction zones. The use of cones, drums, barricades, and adequate lighting is specified. Furthermore, it emphasizes the need for trained personnel to manage traffic, conduct safety audits of construction zones, and ensure clear communication with road users about potential disruptions and hazards.

What is the significance of sight distance in the context of four-lane highway design?+

Sight distance is a critical geometric design parameter that ensures drivers have sufficient visibility to perceive potential hazards and react safely. The manual specifies two main types: Stopping Sight Distance (SSD) and Overtaking Sight Distance (OSD). SSD ensures a driver can stop before colliding with a stationary object, while OSD allows a slower vehicle to be safely overtaken. The required sight distances are directly dependent on the design speed and influence the alignment of both vertical and horizontal curves, as well as the clearance required at intersections and obstructions.

How does the IRC manual address the issue of environmental impact during the construction of four-lane highways?+

The IRC manual mandates the development and implementation of an Environmental Management Plan (EMP) for four-lane highway projects. This plan aims to mitigate the negative environmental impacts associated with construction and operation. Key aspects covered include dust and noise control, management of construction waste, protection of natural habitats, water resource management, and rehabilitation of acquired land. The goal is to ensure sustainable development while minimizing ecological disturbances.

What are the typical median widths specified for four-lane highways?+

The IRC manual specifies median widths based on the functional requirements and the type of terrain. For urban areas, a minimum median width of 5 meters is generally stipulated to provide adequate space for landscaping, lighting, and pedestrian refuge. In rural areas, the minimum median width is often larger, typically 7.5 meters or more, to offer a greater buffer between opposing traffic streams and accommodate service roads or future widening. These medians are crucial for preventing cross-median crashes.

What is the role of quality control and assurance in the context of this IRC code?+

Quality Control (QC) and Quality Assurance (QA) are integral to the successful implementation of this manual. Clause 6.1 and subsequent sub-clauses detail the requirements for ensuring that materials used and workmanship employed meet the specified standards. This includes provisions for material testing (e.g., aggregate strength, binder properties, concrete mix design), field testing (e.g., compaction, pavement thickness), and regular inspections throughout the construction process. A robust QA system ensures that the final constructed highway is safe, durable, and performs as intended.

QA/QC Inspection Templates

📋

QA/QC templates coming soon for this code.

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IRC SP 87 : 2013Manual of Specifications and Standards for Four Laning of Highways

PDF Google Compare IRC Portal

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

AASHTO A Policy on Geometric Design of Highways and Streets (Green Book) · Austroads Guide to Pavement Technology · Design Manual for Roads and Bridges (DMRB) - UK Highways Agency

CurrentFrequently UsedCode of PracticeTransportation · Roads and Pavement

PDF Google Compare IRC Portal

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

Quick Reference — IRC SP 87:2013 Four-Laning Manual

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

✓ Verified 2026-05-15

Reference	Value	Clause
Subject	Specs & standards for 4-laning of highways	Scope
Cross-section	2×2 lanes + median + paved shoulders	Geometry
Design speed	By terrain (plain/rolling/hilly)	Geometry
Pavement	Flexible (IRC 37) / rigid (IRC 58)	Design
Use	NHAI/MoRTH 4-lane project standard	Application
Read with	IRC SP 73 (2-lane) / IRC SP 84	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