IRC 8:1980 is the Indian Standard (IRC) for type designs for navigation lights for obstructions and openings. IRC 8:1980 specifies standard navigation and obstruction lights for bridges, overhead obstructions, and openings on Indian roads and waterways. Though narrower in scope than bridge-design codes, it governs a safety-critical element — without proper lighting, large bridges become night-time hazards to waterway traffic (where applicable) and become less conspicuous to road users. The code defines red pier lights, amber span lights, yellow platform lights, and their intensity, visibility, and arrangement. Compliance is verified at commissioning by state PWD and, for navigable rivers, by the Inland Waterways Authority of India. The code is 45 years old but actively cited — modern LED upgrades are covered under related IS 16094 standards while IRC 8 remains the conceptual framework.
Specifies the type, colour, intensity, arrangement, and installation of navigation lights on bridges, overhead obstructions, crossings, and openings to ensure safe passage of road traffic, waterway traffic, and aviation where applicable.
- Status
- Current
- Usage level
- Specialized
- Domain
- Transportation — Bridges and Bridge Engineering
- Type
- Type Design / Standard Specification
- Amendments
- Amendment No. 1 (2015) — allows modern LED-based lights meeting IS 16094 as alternative to traditional incandescent fixtures; Amendment No. 2 (2022) — requires remote-monitoring capability for major bridges (>200 m span)
Also on InfraLens for IRC 8
Practical Notes
! Major navigable-river bridges on Ganga, Brahmaputra, Godavari must synchronize lighting with Inland Waterways Authority (IWAI) requirements — stricter than IRC 8 alone.
! Foot-over bridges in urban areas are commonly missing the white end-approach lights. Retrofitting these is typically PWD responsibility during electrification upgrades.
! LED-based flashing lights now dominate new installations — 90% lower energy consumption, 5-10× longer life than traditional. IS 16094 covers LED-specific performance.
! Bird strike consideration: flashing lights attract and can disorient migratory birds. On bridges in sanctuary corridors, use amber (not red) and avoid strobe-type flashing.
! Solar-powered navigation lights are emerging for remote bridges (rural state highways) — eliminate grid dependency. Specified in Amendment No. 2.
! Maintenance is often the Achilles heel: PWDs inspect quarterly but replacement is delayed. Specify maintenance funding in construction contracts.
! For coastal bridges (Bandra-Worli, Mumbai Trans-Harbour), saltwater corrosion significantly reduces fixture life. Use stainless steel enclosures with IP66 rating.
! Fog visibility — standard IRC 8 intensity may be insufficient in coastal/riverine fog. For foggy corridors (Ganga plain, West Bengal coast), use higher-intensity LEDs (150+ candela).
! Aviation lighting kicks in at 45 m height above surrounding terrain per ICAO Annex 14 — many tall modern bridges (especially cable-stayed towers) exceed this and need red aviation obstruction lights in addition to navigation lights.
! Bridge site access for maintenance — ensure electrical access (conduit, junction box) at design stage. Retrofitting wiring to mid-span lights is extremely expensive.
! Synchronization between adjacent bridges on same corridor avoids driver confusion. Specify in project DBR.
! Photocell sensitivity — light triggers at ~5 lux ambient. In tropical twilight hours, lights may flicker on/off as ambient changes rapidly. Use hysteresis in control circuit.
! Obstruction lights during construction phase — temporary lights on partially-built bridge piers and superstructure are MANDATORY per IRC 8 and MoRTH specs.
! For high-rise flyovers in urban areas, red aviation-type lights on pier tops (if > 45 m above ground) plus orange/yellow delineators on abutments for road driver safety.
! Power supply reliability — UPS backup minimum 48 hours per IRC 8. For bridges in areas with frequent power outages, 72-96 hours may be specified in project-specific requirements.
! Lighting on foot-over bridges during construction — often neglected, has caused pedestrian accidents. Temporary lights on walkways with battery/solar backup until permanent system commissioned.
! Beam-angle of flashing lights: narrow-beam LEDs direct light to navigation channel; wide-angle for general obstruction. Specify appropriate type per bridge configuration.
! Compliance during monsoon: flooded substructure bases should not short out lighting circuits. IP68 rating for fixtures in submersible zones.
! Ice/snow on lights (Himalayan bridges): heated fixture enclosures or manual cleaning protocol. Standard fixtures may fail in severe winter.