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Hazard markers should reflect _______________ light, visible at least from a distance of about ___________.
red; 150 m
yellow; 150 m
red; 500 m
yellow; 500 m
yellow; 150 m
Hazard markers are retro-reflective traffic control devices used to alert drivers to obstacles within or adjacent to the roadway. As per the Indian Roads Congress (IRC) standards, these markers must be yellow and visible to a driver under normal atmospheric conditions from a distance of at least 150 m.
IRC:67-2012
Hazard markers are retro-reflective traffic control devices used to alert drivers to obstacles within or adjacent to the roadway. As per the Indian Roads Congress (IRC) standards, these markers must be yellow and visible to a driver under normal atmospheric conditions from a distance of at least 150 m.
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Hazard markers function via retro-reflection, where light from vehicle headlights hitting the marker surface is reflected back towards the source. The yellow color provides high contrast against the surrounding environment, ensuring visibility during both day and night conditions. The 150 m distance provides sufficient perception-reaction time for a driver to steer away from the obstruction at standard design speeds.
Hazard markers are placed at obstructions like bridge abutments, piers, or narrow culverts.
The yellow color signifies caution/warning, distinct from red used for stop signs.
Retro-reflective sheeting meeting high-intensity grades is required for night-time legibility.
Installation height is generally kept consistent with vehicle headlamp illumination patterns.
Enhances night-time safety by increasing target conspicuity.
Reduces the risk of vehicle collisions with fixed roadside objects.
Subject to degradation due to weathering and dust accumulation.
Requires periodic maintenance to maintain retro-reflectivity coefficients.
Bridge piers and abutments
Narrow culverts and underpasses
Roadside guardrail ends
IRC:67 specifies the design, color, and size of traffic signs in India.
A visibility distance of 150 m allows for a reaction time of approximately 3-5 seconds for vehicles traveling at 80-100 km/h.
Option A and C are incorrect as red is typically reserved for regulatory 'Stop' or 'Prohibition' signs, not hazard warning.
B is correct тАФ Hazard markers must be yellow and visible from at least 150 m as per standard traffic safety guidelines.
Remember that red is almost exclusively for 'regulatory' signs (stop, do not enter), while yellow is for 'warning' signs (hazards, sharp turns). This semantic color coding is consistent across the Indian Manual on Traffic Signs.
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