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IS 7634 Part 1 : 1974Code of Practice for Level Crossings: Part 1 General Requirements

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MUTCD 2009 Edition with revisions · AREMA MRE Chapter 30 · AS 1742.7
CurrentSpecializedCode of PracticeBIMTransportation · Railway Engineering
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OverviewValues6InternationalTablesFAQ4

IS 7634:1974 Part 1 is the Indian Standard (BIS) for level crossings: part 1 general requirements. This standard outlines the general requirements for the design, classification, and safety equipment of railway level crossings. It categorizes crossings based on traffic density (Train Vehicle Units) and specifies standards for siting, road approaches, gates, and visibility to ensure public safety at the intersection of road and rail lines.

Specifies general requirements for the design, construction, and maintenance of railway level crossings.

Overview

Status
Current
Usage level
Specialized
Domain
Transportation — Railway Engineering
Type
Code of Practice
Amendments
Amendment 1 (May 1980); Amendment 2 (November 1983)
International equivalents
MUTCD 2009 Edition with revisions · Federal Highway Administration (FHWA), USAAREMA MRE Chapter 30 · American Railway Engineering and Maintenance-of-Way Association (AREMA), USAAS 1742.7:2016 · Standards Australia, AustraliaCommission Regulation (EU) No 1299/2014 (TSI INF) · European Union Agency for Railways (ERA), European Union
Also on InfraLens for IS 7634
6Key values1Tables4FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes
! The classification of a level crossing (Special, A, B, C, D) based on Train Vehicle Units (TVU) is the most critical aspect, as it dictates all subsequent safety and equipment requirements.
! While this IS code is a foundational document, always consult the latest Indian Railways Permanent Way Manual (IRPWM) and directives from the respective Zonal Railway, which often supersede or supplement these guidelines.
! Ensure strict adherence to the visibility requirements (sighting triangle) for both road users and the train driver, as this is a primary factor in preventing accidents.
Frequently referenced clauses
Cl. 3Classification of Level CrossingsCl. 4Equipment for Level CrossingsCl. 5Siting of Level CrossingsCl. 6Road Approaches
Pulled from IS 7634:1974. Browse the full clause & table index below in Tables & Referenced Sections.
Updates & Amendments2 amendments
Amendment 1 (May 1980)
Amendment 2 (November 1983)
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
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International Equivalents

Similar International Standards
MUTCD 2009 Edition with revisionsFederal Highway Administration (FHWA), USA
HighCurrent
Manual on Uniform Traffic Control Devices for Streets and Highways
Covers signs, signals, markings, and geometric considerations for highway-rail grade crossings (Part 8).
AREMA MRE Chapter 30American Railway Engineering and Maintenance-of-Way Association (AREMA), USA
HighCurrent
Manual for Railway Engineering, Chapter 30: Ties, Fastenings, and Roadway
Provides detailed engineering design guidance for highway-rail grade crossings from a railway perspective.
AS 1742.7:2016Standards Australia, Australia
HighCurrent
Manual of uniform traffic control devices - Part 7: Railway crossings
Specifies requirements for signs, devices, and general principles for the control of traffic at and near railway crossings.
Commission Regulation (EU) No 1299/2014 (TSI INF)European Union Agency for Railways (ERA), European Union
MediumCurrent
Technical Specification for Interoperability relating to the ‘infrastructure’ subsystem of the rail system in the European Union
Sets high-level safety and interoperability requirements for new or upgraded lines, including level crossings.
Key Differences
≠The Indian standard from 1974 is highly prescriptive, specifying fixed requirements based on broad classifications. Modern international standards (e.g., AREMA, UK's ORR) are predominantly risk-based, requiring detailed risk assessments (considering traffic volume, train speed, local conditions) to determine the necessary level of protection.
≠IS 7634 classifies crossings based on a simple Traffic Vehicle Unit (TVU) metric. International standards use more sophisticated classification systems considering train speeds, number of tracks, road user types, sightline restrictions, and other risk factors.
≠Modern standards like the MUTCD specify detailed requirements for active warning systems, including minimum warning times (e.g., 20 seconds), fail-safe operations, and integration with traffic signal systems to prevent vehicles queuing on tracks, concepts which are not detailed in the 1974 Indian standard.
≠IS 7634 reflects the technology of its era, with a focus on manned gates and basic signage. International equivalents are built around automated systems, including flashing lights, boom gates, advanced train detection circuits, and remote condition monitoring.
≠International standards incorporate extensive human factors research into the design and placement of signs and signals, driver perception-reaction times, and the conspicuity of warnings. IS 7634 provides basic principles without this level of detailed human factors engineering.
Key Similarities
≈All standards share the fundamental objective of ensuring the safety of both road users and rail traffic at the point of intersection.
≈The critical importance of providing adequate sight distance for road users to see an approaching train is a core principle in both IS 7634 and all modern international standards, though calculation methods vary.
≈All standards mandate specific geometric controls for the road approach, such as limiting steep gradients and ensuring a relatively level profile across the tracks to prevent vehicles from stalling or getting stuck.
≈The use of a hierarchy of crossing types, from passive (signs only) for low-traffic locations to active (gates and signals) for high-traffic or high-speed locations, is a common concept across all the standards.
≈The principle of providing advance warning signs on the road approach to inform drivers of an upcoming level crossing is a universal requirement in all mentioned standards.
Parameter Comparison
ParameterIS ValueInternationalSource
Minimum crossing angle (road vs. track)Should not be less than 45 degrees.Should be as close to 90 degrees as practical; some jurisdictions specify a minimum of 60-70 degrees.FHWA MUTCD / General Practice
Road approach gradient (within 30m of crossing)Not steeper than 1 in 30 (3.33%).The road should be approximately level. Where not possible, gradients are minimized and generally should not exceed 3% for a certain distance.AREMA MRE
Minimum warning time for active crossings (lights/gates)Not explicitly specified as a minimum second value; requires 'adequate warning'.A minimum of 20 seconds warning must be provided before the arrival of the train.FHWA MUTCD, Part 8
Sight distance requirement basisBased on a fixed table of train speed vs. distance required for a road vehicle to clear the track.Based on complex formulas considering train speed, road vehicle design characteristics (length, speed, acceleration), and driver perception-reaction time.AREMA MRE
Level section of road across tracksSpecifies a 'level portion' of 16m or width of carriageway plus 6m.Road profile should be level for a distance that accommodates the longest design vehicle using the crossing (e.g., 20-30m).FHWA MUTCD / AS 1742.7
Minimum width of surfaced crossingMinimum 5.5m for a two-lane road.Should be at least as wide as the travelled way plus shoulders; often specified as 0.3m-0.6m (1-2 ft) wider than the approach road on each side.AREMA MRE
⚠ Verify details from original standards before use

Key Values6

Quick Reference Values
Minimum angle of road and railway intersection45 degrees
Preferred angle of road and railway intersection90 degrees
Maximum road approach gradient1 in 30
Minimum width of carriageway at level crossing5.5 m
Standard height of gate post above road level1.2 m
Minimum distance of gate post from centre line of nearest track3 m

Tables & Referenced Sections

Key Tables
Table 1 - Classification of Level Crossings and Standards of Interlocking/Protection
Key Clauses
Clause 3 - Classification of Level Crossings
Clause 4 - Equipment for Level Crossings
Clause 5 - Siting of Level Crossings
Clause 6 - Road Approaches

Frequently Asked Questions4

What are the different classes of level crossings?+
Level crossings are classified as Special, 'A', 'B', 'C', and 'D' Class, based on Train Vehicle Units (TVU) and other specific conditions as per Clause 3 and Table 1.
What is the steepest permissible gradient for a road approaching a level crossing?+
The gradient of road approaches shall not be steeper than 1 in 30 (Clause 6.1).
What is the minimum angle at which a road can cross a railway track?+
The road should cross the railway line at an angle not less than 45 degrees, though a right angle (90 degrees) is preferred (Clause 5.2).
What is the basis for classifying level crossings?+
The primary basis is the 'Train Vehicle Units' (TVU), calculated by multiplying the number of trains per day by the number of road vehicles per day over a given period (Clause 3.1).

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