Crash Barriers

Crash barriers are designed to withstand the impact of vehicles of certain weights at certain angle while traveling at the specified speed. They are expected to guide the vehicle back on the road while keeping the level of damage to vehicle as well as to the barriers within acceptable limits.Ideally a crash barrier should present a continuous smooth face to an impacting vehicle, so that the vehicle is redirected, without overturning, to a course that is nearly parallel to the barrier face and with a lateral deceleration, which is tolerable to the motorist. To achieve these aims the vehicle must be redirected without rotation about both its horizontal or vertical axis (that is, without ‘spinning out’ or overturning), and the rate of lateral deceleration must be such as to cause the minimum risk of injury to he passengers.

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Pedestrian Railings/ Guardrails

Where considerable pedestrian traffic is expected, railing in the median of the road and reinforced concrete crash barrier is provided separating the vehicular and pedestrian traffic. For rigid railing, the strength should be equivalent to that of rigid RCC type. For areas of low intensity of pedestrian traffic, semi-rigid type of railings, such as concrete, steel, etc. can be adopted.

Objectives

Pedestrian guardrails in the vicinity of zebra crossing should be of sufficient length to deter pedestrians from crossing the road at any arbitrary point along the road. Nighttime visibility of zebra crossing is of vital importance and this can be achieved through proper lighting of the intersection area.

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Dividers

Dividers are usually provided to earmark the segregated movement of a particular type/ category of traffic, such as, segregating through carriage way from a service road for local traffic, segregating light and heavy traffic, segregating through traffic from turning traffic and dedicated BRT corridor and corridors for non-motorized transport (cycles, rickshaws etc.). The dividers can be within form of low height central verge, curb, railing, etc. which can be either permanent (steel, concrete etc) or flexible/ movable, shift able such as rubberized cones, precast curbs and electrically/ mechanically operated shift able divider railings.

Objectives

Central dividers on wide roads ensure that vehicles confine their movements only to the correct carriageway, thus avoiding any conflict with traffic from the opposite direction. The rails over central dividers can be provided to ensure that pedestrians do not cross erratically or spill over the carriageway.

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