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IRC 64 : 2017Guidelines for Capacity of Roads in Rural Areas

Q: What is the primary purpose of IRC 103:2012?

The primary purpose of IRC 103:2012 is to provide guidelines for calculating the traffic-carrying capacity of rural roads. It helps engineers understand how much traffic a rural road can handle under various conditions while maintaining a certain level of service. This is essential for planning new roads, improving existing ones, and managing traffic flow efficiently in rural areas.

Q: How does the capacity of a rural road differ from that of an urban road according to IRC codes?

Rural roads typically have lower capacities than urban roads due to factors like lower design speeds, presence of mixed traffic (including slow-moving vehicles and animal-drawn vehicles), less stringent access control, and often less predictable traffic flow patterns. IRC 103 specifically addresses these rural-specific conditions, whereas other IRC codes might cover urban road capacity with different considerations.

Q: What is a 'Level of Service' (LOS) in the context of rural roads?

A Level of Service (LOS) is a qualitative measure describing the operational conditions within a traffic stream and their perception by drivers and passengers. For rural roads, LOS ranges from 'A' (best, free flow) to 'F' (worst, congested). It is typically defined by metrics like traffic density and average speed, indicating how 'good' or 'bad' the driving experience is on a particular road segment.

Q: What is a Passenger Car Unit (PCU) and why is it important for rural road capacity?

A Passenger Car Unit (PCU) is a concept used to express the effect of different types of vehicles on traffic flow relative to a standard passenger car. On rural roads, a wide variety of vehicles like trucks, buses, motorcycles, tractors, and even animal-drawn carts operate. The PCU equivalents provided in IRC 103 allow engineers to convert the mixed traffic volume into an equivalent passenger car volume, which is essential for applying capacity calculation methodologies consistently.

Q: How do geometric features like curves and grades affect rural road capacity?

Geometric features significantly impact the capacity of rural roads. Sharp horizontal curves and steep grades require vehicles to reduce their speed, thus increasing traffic density and reducing the overall flow rate. IRC 103 provides specific adjustment factors that are applied to the base capacity to account for the capacity-reducing effects of these geometric elements.

Q: What is the role of shoulder width in rural road capacity?

Shoulder width plays a crucial role in the capacity and operational efficiency of rural roads. Wider shoulders provide space for slow-moving vehicles or breakdowns to move out of the main travel lane, minimizing disruption to through traffic. They also contribute to driver comfort and safety. IRC 103 includes adjustment factors that increase capacity with wider shoulders.

Q: How does the presence of intersections impact the capacity of a rural road?

Intersections, even simple rural cross-roads or driveways, act as points of conflict and disruption, reducing the capacity of the road segment. Traffic must slow down or stop to navigate intersections, and turning movements can further impede flow. IRC 103 provides methods to account for this capacity reduction due to intersection density.

Q: What is a 'Peak Hour Factor' (PHF) and how is it used?

The Peak Hour Factor (PHF) is a measure of the variability of traffic flow within the peak hour. A PHF of 1.00 indicates perfectly uniform flow, while lower values indicate more fluctuation. A lower PHF suggests that the peak hour traffic is more concentrated, and the capacity might be reached more easily. The PHF is used to relate the average hourly volume to the maximum 15-minute volume, influencing the service volume calculation.

Q: Can IRC 103 be used for the design of national highways in rural areas?

While IRC 103 provides guidelines for rural roads, its primary focus is on typical rural roads that may not have the same traffic volumes or design standards as national highways. For national highways in rural areas, other more comprehensive IRC codes (e.g., related to highway design and geometric design) might be more directly applicable or used in conjunction with IRC 103 for capacity analysis of specific segments.

Q: How are animal-drawn vehicles and tractors handled in capacity calculations?

Animal-drawn vehicles and tractors are considered significant elements of mixed traffic on rural roads. IRC 103 provides specific Passenger Car Unit (PCU) equivalents for these vehicles, reflecting their slower speeds and larger space occupancy compared to passenger cars. These PCU values are used to convert the mixed traffic volume into an equivalent passenger car volume for capacity analysis.

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Highway Capacity Manual (HCM) - Transportation Research Board (TRB), USA · Austroads Guide to Road Design, Part 3: Geometric Design - Austroads, Australia

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IRC 64:2017 is the Indian Standard (IRC) for guidelines for capacity of roads in rural areas. IRC 103:2012 focuses on the fundamental principles of rural road capacity analysis. It defines capacity in terms of the maximum volume of traffic that a road can handle under prevailing conditions while maintaining a specified level of service. The code emphasizes the unique factors influencing rural road capacity, such as lower operating speeds, presence of mixed traffic (including slow-moving vehicles and animal-drawn vehicles), limited access control, and varying road geometries. It provides methodologies for calculating capacity and service volume for different types of rural roads, including single-lane, intermediate-lane, and two-lane roads, taking into account the impact of shoulder width, horizontal and vertical curves, and intersections.

This IRC code provides guidelines for determining the capacity of rural roads, considering their specific geometric characteristics, traffic composition, and operational conditions. It aims to assist engineers in planning, designing, and assessing the performance of rural road networks.

Quick Reference — IRC 64:2017 Capacity of Rural Roads

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

✓ Verified 2026-05-15

Reference	Value	Clause
Subject	Capacity of roads in rural areas	Scope
Capacity unit	PCU/day (or PCU/hour) by road type	Metric
PCU factors	Vehicle-class equivalency (slow + mixed traffic)	Method
Capacity governed by	Carriageway width, terrain, traffic mix	Design
Use	Upgrade/widening warrant (single→intermediate→2-lane)	Application
Read with	IRC 73 (rural roads) / IRC 106 (urban capacity)	Cross-ref

⚠ Indicative reference values from the code/standard practice; the 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

Highway Capacity Manual (HCM) - Transportation Research Board (TRB), USA Austroads Guide to Road Design, Part 3: Geometric Design - Austroads, Australia

Also on InfraLens for IRC 64

16Key values 6Tables 10FAQs

Practical Notes

! When calculating the capacity of a rural road, it is crucial to accurately identify and quantify all relevant adjustment factors.

! The PCU equivalents provided in the code are specific to rural conditions and may differ from urban values.

! Animal-drawn vehicles and tractors are significant contributors to mixed traffic on many rural roads and must be accounted for.

! The presence of wide shoulders can significantly improve the capacity and operational efficiency of rural roads.

! Sharp horizontal curves and steep grades will drastically reduce the capacity of a road segment.

! Intersections, even uncontrolled ones, create bottlenecks and reduce the capacity of the approach road.

! Consider the impact of roadside development and pedestrian activity, even in rural settings, as this can affect capacity.

! The 'level of service' chosen for a rural road should align with the expected usage and user expectations.

! Regular traffic counts and surveys are essential to obtain accurate data for capacity analysis.

! When dealing with new construction, it is advisable to design for a higher level of service than initially required to accommodate future growth.

! For capacity analysis of existing roads, data collection should reflect the actual operating conditions, including any existing deficiencies.

! The peak hour factor is a critical parameter; an understanding of traffic flow patterns within the peak hour is necessary for its accurate estimation.

! When multiple geometric deficiencies exist on a road segment, their combined impact on capacity can be synergistic and should be carefully assessed.

! The guidelines are most effective when used in conjunction with local traffic data and engineering judgment.

Frequently referenced clauses

Cl. 2.1Introduction

Cl. 2.2Definitions

Cl. 3.1Factors Affecting Rural Road Capacity

Cl. 4.1Methodology for Capacity Estimation

Cl. 4.2Base Capacity of Rural Roads

Cl. 5.1Adjustment Factors

Cl. 6.1Level of Service Criteria for Rural Roads

Cl. 7.1Application in Planning and Design

Rural RoadsRoad CapacityTraffic EngineeringHighway DesignTransportation PlanningLevel of ServiceService VolumePassenger Car UnitGeometric DesignTraffic FlowIRC

Engineer's Notes

In Practice — Editorial Commentary

When IRC 64 is your governing code

IRC 64 specifies guidelines for capacity of roads in rural areas — methods to estimate the traffic-carrying capacity of rural and semi-urban roads (single lane, intermediate lane, two-lane, two-lane with paved shoulders, multilane), including the effect of road geometry, terrain, traffic composition, and operating conditions on capacity.

Use IRC 64 in: - New road planning — sizing the road for projected 15-20 year traffic - Capacity analysis of existing roads — bottleneck identification, upgrade decisions - Traffic impact assessments for development projects (housing, industry, ports) - Investment justification — road widening / four-laning / six-laning decisions - PMGSY upgrade decisions (single-lane to intermediate lane, intermediate to two-lane) - Service-level analysis on operating roads

IRC 64 distinguishes between: - Capacity — maximum hourly flow (vehicles/hour, or PCU/hour after passenger-car-unit conversion) under specified operating conditions - Service volume — flow at a specified Level of Service (LoS A, B, C, D, E) - Design service volume — capacity used for road sizing decisions (typically LoS C for rural, LoS B for new)

This code is the rural-roads capacity manual; for urban roads, see IRC:106. For expressways and high-speed corridors, IRC:73 + IRC:106 + project-specific HCM analyses are used.

Capacity values (the headline numbers)

Capacity per direction (vehicles per hour, mixed traffic, ideal conditions):

| Road type | Plain terrain | Rolling terrain | Hilly terrain | |---|---|---|---| | Single lane (3.75 m) | 800 PCU/h | 600 PCU/h | 400 PCU/h | | Intermediate lane (5.5 m) | 1,400 PCU/h | 1,000 PCU/h | 700 PCU/h | | Two lane (7 m, undivided) | 2,000 PCU/h per direction | 1,500 PCU/h | 1,000 PCU/h | | Four lane (14 m, divided) | 3,500 PCU/h per direction | 2,800 PCU/h | 1,800 PCU/h | | Six lane (21 m, divided) | 5,500 PCU/h per direction | 4,500 PCU/h | 3,000 PCU/h |

Passenger Car Unit (PCU) factors:

| Vehicle type | Plain | Hilly | |---|---|---| | Two-wheeler | 0.5 | 0.5 | | Car / jeep | 1.0 | 1.0 | | Auto-rickshaw | 0.8 | 0.8 | | Bus | 3.0 | 3.5 | | Truck (single unit) | 3.0 | 3.5 | | Truck-trailer | 4.5 | 5.0 | | Tractor + trailer | 4.5 | 5.0 | | Bicycle / cycle rickshaw | 0.5 | 0.5 | | Pedestrian (cross-flow) | adjust separately |

Adjustments (multiply ideal capacity by): - Lane width < standard: 0.85-0.95 - Shoulder width < 1.5 m: 0.90 - Heavy commercial vehicle % > 50: 0.85 - Steep grades (> 4 % > 100 m length): 0.70-0.85 - Narrow bridges, sharp curves: 0.85 - Pedestrian / bicycle activity: 0.85-0.95

Level of Service (LoS) flow ratios (V/C):

| LoS | V/C ratio | Description | Use | |---|---|---|---| | A | < 0.30 | Free flow | Aspirational; rural new construction | | B | 0.30-0.50 | Stable flow, reasonable freedom | New construction target | | C | 0.50-0.70 | Stable flow, restricted freedom | Operating design level | | D | 0.70-0.85 | Approaching unstable | Acceptable on existing roads | | E | 0.85-1.00 | Unstable, capacity | Congested | | F | > 1.00 | Forced flow, breakdown | Failed |

How to use it (worked example)

Worked example — sizing a new rural road:

A new district road is to be designed for 15-year horizon traffic. Survey shows current AADT 4,000 vehicles/day; projected 8,500 by year 15. Composition: 50 % cars, 20 % two-wheelers, 15 % trucks, 10 % buses, 5 % miscellaneous.

1. Convert to PCU/day: - Cars: 4250 × 1.0 = 4,250 PCU/d - Two-wheelers: 1700 × 0.5 = 850 PCU/d - Trucks: 1275 × 3.0 = 3,825 PCU/d - Buses: 850 × 3.0 = 2,550 PCU/d - Misc: 425 × 1.0 = 425 PCU/d - Total: ~12,000 PCU/d

2. Convert to peak-hour flow: - Peak-hour factor (rural): 8-10 % of daily flow → ~1,000 PCU/h

3. Match to road type from capacity table (plain terrain): - Single lane (800 PCU/h): V/C = 1000/800 = 1.25 → LoS F (failed) - Intermediate lane (1400 PCU/h): V/C = 1000/1400 = 0.71 → LoS D (acceptable) - Two lane (2000 PCU/h per direction, ~3000 PCU/h two-way undivided): V/C = 0.33 → LoS B (target)

4. Design recommendation: two-lane road. Provides LoS B at horizon year — comfortable margin for further growth.

5. Geometric design (IRC:73:1980): two-lane 7 m carriageway, 1.5 m earthen shoulders, design speed 80 km/h, vertical curves per IRC SP 23.

6. Pavement design (IRC:37:2018): based on commercial vehicle daily count and CBR.

7. Capacity reserve — design for LoS B (V/C 0.33-0.50) ensures future-proof against demand growth or composition shift (more trucks).

Companion codes (must pair with)

IRC:73:1980 — geometric design standards for rural highways (sets the lane width, shoulder, and other inputs to capacity).
IRC:37:2018 — flexible pavement design (capacity drives traffic input to pavement design).
IRC SP 72:2015 — flexible pavement design for low-volume rural roads.
IRC:38:1988 — horizontal curve design (curve radius affects capacity through speed reduction).
IRC SP 23:2012 — vertical curve design.
IRC:66:1976 — sight distance on rural highways.
IRC:106:1990 — capacity of urban roads (the urban counterpart to IRC 64).
IRC SP 41:2005 — at-grade intersections (intersections often govern corridor capacity, not link capacity).
IRC SP 87:2018 — interchange design (grade-separated capacity).
IRC:64:1990 — older revision (some older NHAI projects still cite).
IRC SP 84 — Service Roads Design.
US Highway Capacity Manual (HCM) — international reference, sometimes used by Indian consultants for advanced analyses (LoS calculations, multilane analysis).
MoRTH Specifications for Road and Bridge Works — the contract document for road construction.

Common pitfalls / what reviewers flag

1. Using AADT (annual average daily traffic) directly as capacity input. Capacity is hourly, AADT is daily. Convert via peak-hour factor (rural: 8-10 % of daily; urban: 6-8 %). 2. Forgetting PCU conversion. A road with 50 % heavy trucks has very different effective flow than a 50 % car road, even with same vehicle count. Always convert via PCU factors. 3. Designing for current year traffic. Roads serve 15-30 years; design for projected 15- to 20-year traffic at minimum. Growth rate typically 5-10 % per annum for Indian roads. 4. Ignoring intersection capacity. Most road corridors are limited by intersection capacity, not link capacity. A 4-lane road with a bottleneck signal at every km drops to 1,200-1,800 PCU/h effective. Apply IRC SP 41 or capacity software (SIDRA, VISSIM) for intersection-controlled segments. 5. Standard capacity values without local adjustment. Adjustments for narrow lanes, shoulders, side friction, terrain are real and significant. Ignore them and you over-estimate capacity by 20-40 %. 6. Not accounting for non-motorised traffic. Bicycles, animal carts, pedestrians on rural roads consume 'capacity' of the lanes they share with motor traffic. Apply the appropriate adjustment. 7. Heavy local turning movements not modelled. Side roads, village exits, market entries cause friction, slowing through-traffic. Capacity drops substantially in such zones. 8. Aspirational LoS A on rural road designs. LoS A means very low V/C (< 0.30), implies wasteful overdesign. Aim for LoS B or C; LoS A is for special corridors only (e.g., new expressways). 9. No consideration of seasonal variation. Festival traffic, harvest season, market days — these can spike traffic 2-3× routine. Design hour traffic ≠ AADT/365 × peak-hour factor; check for special peaks. 10. Mixing 'lane capacity' and 'directional capacity'. Two-lane undivided road: 2,000 PCU/h per direction in IRC 64; some confusion with HCM 'two-lane two-way' which is total capacity both directions ~1,800-2,800 PCU/h. Use IRC convention consistently. 11. Not checking for safety implications of high V/C. High capacity utilisation correlates with higher accident rates (less time gap, less recovery margin). Combined safety + capacity analysis is best practice.

Where it sits in road planning + design

Standard road planning cascade:

1. Need identification — connectivity, congestion, deteriorated road, new development. 2. Origin-destination + traffic survey — current AADT, peak-hour, composition, growth rate. 3. Forecast traffic — to design horizon (15-20 years for highways, 10 for rural roads). 4. Capacity analysis (this code, IRC 64) — match projected demand to road type / lane configuration / LoS target. 5. Geometric design (IRC:73, IRC:38, IRC SP 23) — width, alignment, sight distance, junctions. 6. Intersection design (IRC SP 41, IRC SP 87) — at-grade signalised, grade-separated. 7. Pavement design (IRC:37 or IRC:58) — flexible or rigid based on life-cycle cost. 8. Cross-drainage + side drainage. 9. Cost estimation + financial analysis — life-cycle cost, IRR, BCR. 10. Tendering + construction. 11. Operation + monitoring — traffic counts validate forecast; trigger expansion if forecast exceeded.

Use IRC 64 strategically: - For new road: forecast traffic → capacity table → road type → LoS validation - For existing road upgrade: count + composition → check current LoS → if LoS D or worse, plan widening/upgrade - For investment justification: BCR / IRR analysis using time-savings and operating-cost reductions enabled by capacity expansion - For corridor planning: identify weakest-capacity link in the corridor; that's where investment is most leveraged

International Equivalents

Similar International Standards

Highway Capacity Manual (HCM) - Transportation Research Board (TRB), USA

MediumCurrent

Austroads Guide to Road Design, Part 3: Geometric Design - Austroads, Australia

MediumCurrent

Key Differences

≠

Key Similarities

≈

Parameter Comparison

Parameter	IS Value	International	Source
Vehicle Classes		Defined vehicle types (cars, trucks, buses, RVs, light trucks, etc.)
Peak Hour Factor (PHF)		Used across various standards for traffic flow variability within the peak hour.
Level of Service (LOS)		Ranges (e.g., A-F) with performance measures like density, speed, delay.
Adjustment Factors		Factors for lanes, shoulders, traffic composition, grade, curves, etc.

⚠ Verify details from original standards before use

Key Values16

Quick Reference Values

capacity definitionMaximum volume of traffic that a given length of roadway can accommodate at a specified level of service.

level of service definitionQualitative measure describing operational conditions within a traffic stream and their perception by drivers and passengers.

rural road types["Single-lane roads","Intermediate-lane roads","Two-lane roads"]

service volume definitionMaximum number of vehicles that can pass a given point or section of a lane or roadway during a specified time period under prevailing conditions at a given level of service.

peak hour factor rangeTypically ranges from 0.70 to 0.95, reflecting the variation in traffic flow within the peak hour.

adjustment factor for shoulder widthReduces capacity with narrower shoulders.

adjustment factor for horizontal curvesReduces capacity with tighter curves.

adjustment factor for gradesReduces capacity on upgrades, especially for heavy vehicles.

adjustment factor for intersection densityReduces capacity due to interference from intersections.

adjustment factor for side frictionAccounts for the presence of roadside development and pedestrian activity.

adjustment factor for weather conditionsConsiders the impact of adverse weather on capacity.

adjustment factor for driver populationAccounts for differences in driving behavior.

passenger car unit conversion factorsSpecific values for different vehicle types (e.g., trucks, buses, motorcycles, animal-drawn vehicles) on rural roads.

design speed for rural roadsRanges from 40 kmph to 80 kmph, depending on the road classification.

jam density conceptThe maximum density of vehicles on a roadway, representing congested flow.

free flow speed definitionThe average speed of vehicles under low-volume conditions where drivers are not constrained by traffic interactions.

Key Formulas

Actual Capacity = Base Capacity x Sum of Adjustment Factors (multiplicative)

Service Volume = Capacity x Peak Hour Factor (PHF)

Density = Volume / Speed

Adjusted Capacity = Base Capacity x CF_shoulder x CF_curve x CF_grade x CF_intersection ...

Tables & Referenced Sections

Key Tables

Base Capacity of Rural Roads (PCU per hour per lane)

Passenger Car Unit (PCU) Equivalents for Different Vehicle Types on Rural Roads

Adjustment Factors for Shoulder Width

Adjustment Factors for Horizontal Curves

Adjustment Factors for Grades

Level of Service Criteria for Rural Roads (Density in PCU/km/lane)

Frequently Asked Questions10

What is the primary purpose of IRC 103:2012?+

The primary purpose of IRC 103:2012 is to provide guidelines for calculating the traffic-carrying capacity of rural roads. It helps engineers understand how much traffic a rural road can handle under various conditions while maintaining a certain level of service. This is essential for planning new roads, improving existing ones, and managing traffic flow efficiently in rural areas.

How does the capacity of a rural road differ from that of an urban road according to IRC codes?+

Rural roads typically have lower capacities than urban roads due to factors like lower design speeds, presence of mixed traffic (including slow-moving vehicles and animal-drawn vehicles), less stringent access control, and often less predictable traffic flow patterns. IRC 103 specifically addresses these rural-specific conditions, whereas other IRC codes might cover urban road capacity with different considerations.

What is a 'Level of Service' (LOS) in the context of rural roads?+

A Level of Service (LOS) is a qualitative measure describing the operational conditions within a traffic stream and their perception by drivers and passengers. For rural roads, LOS ranges from 'A' (best, free flow) to 'F' (worst, congested). It is typically defined by metrics like traffic density and average speed, indicating how 'good' or 'bad' the driving experience is on a particular road segment.

What is a Passenger Car Unit (PCU) and why is it important for rural road capacity?+

A Passenger Car Unit (PCU) is a concept used to express the effect of different types of vehicles on traffic flow relative to a standard passenger car. On rural roads, a wide variety of vehicles like trucks, buses, motorcycles, tractors, and even animal-drawn carts operate. The PCU equivalents provided in IRC 103 allow engineers to convert the mixed traffic volume into an equivalent passenger car volume, which is essential for applying capacity calculation methodologies consistently.

How do geometric features like curves and grades affect rural road capacity?+

Geometric features significantly impact the capacity of rural roads. Sharp horizontal curves and steep grades require vehicles to reduce their speed, thus increasing traffic density and reducing the overall flow rate. IRC 103 provides specific adjustment factors that are applied to the base capacity to account for the capacity-reducing effects of these geometric elements.

What is the role of shoulder width in rural road capacity?+

Shoulder width plays a crucial role in the capacity and operational efficiency of rural roads. Wider shoulders provide space for slow-moving vehicles or breakdowns to move out of the main travel lane, minimizing disruption to through traffic. They also contribute to driver comfort and safety. IRC 103 includes adjustment factors that increase capacity with wider shoulders.

How does the presence of intersections impact the capacity of a rural road?+

Intersections, even simple rural cross-roads or driveways, act as points of conflict and disruption, reducing the capacity of the road segment. Traffic must slow down or stop to navigate intersections, and turning movements can further impede flow. IRC 103 provides methods to account for this capacity reduction due to intersection density.

What is a 'Peak Hour Factor' (PHF) and how is it used?+

The Peak Hour Factor (PHF) is a measure of the variability of traffic flow within the peak hour. A PHF of 1.00 indicates perfectly uniform flow, while lower values indicate more fluctuation. A lower PHF suggests that the peak hour traffic is more concentrated, and the capacity might be reached more easily. The PHF is used to relate the average hourly volume to the maximum 15-minute volume, influencing the service volume calculation.

Can IRC 103 be used for the design of national highways in rural areas?+

While IRC 103 provides guidelines for rural roads, its primary focus is on typical rural roads that may not have the same traffic volumes or design standards as national highways. For national highways in rural areas, other more comprehensive IRC codes (e.g., related to highway design and geometric design) might be more directly applicable or used in conjunction with IRC 103 for capacity analysis of specific segments.

How are animal-drawn vehicles and tractors handled in capacity calculations?+

Animal-drawn vehicles and tractors are considered significant elements of mixed traffic on rural roads. IRC 103 provides specific Passenger Car Unit (PCU) equivalents for these vehicles, reflecting their slower speeds and larger space occupancy compared to passenger cars. These PCU values are used to convert the mixed traffic volume into an equivalent passenger car volume for capacity analysis.

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IRC 64 : 2017Guidelines for Capacity of Roads in Rural Areas

PDF Google Compare IRC Portal

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

Highway Capacity Manual (HCM) - Transportation Research Board (TRB), USA · Austroads Guide to Road Design, Part 3: Geometric Design - Austroads, Australia

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 64:2017 Capacity of Rural Roads

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

✓ Verified 2026-05-15

Reference	Value	Clause
Subject	Capacity of roads in rural areas	Scope
Capacity unit	PCU/day (or PCU/hour) by road type	Metric
PCU factors	Vehicle-class equivalency (slow + mixed traffic)	Method
Capacity governed by	Carriageway width, terrain, traffic mix	Design
Use	Upgrade/widening warrant (single→intermediate→2-lane)	Application
Read with	IRC 73 (rural roads) / IRC 106 (urban capacity)	Cross-ref

⚠ Indicative reference values from the code/standard practice; the 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