Bengaluru: Green creepers growing across Bengaluru’s grey flyovers may look attractive from a distance, but their roots emerging from cracks, joints and gaps are raising concerns over the maintenance of the city’s elevated structures.

Vegetation found on several flyovers

A reality check at seven flyovers — Richmond Circle, Nayandahalli, Mysuru Road, KR Pura hanging cable bridge, National College flyover in Basavanagudi, Kengeri and Tin Factory — found weeds, creepers and tree growth taking root in parts of the structures.

At Richmond Circle, some weeds have roots hanging four to six feet from the flyover. At KR Pura, creepers have spread along one side, while smaller growth has been noticed at Kengeri, Nayandahalli and Mysuru Road.

Peepal and ficus-like plants have also emerged from gaps in some structures.

Roots could worsen existing damage

Experts said the bigger concern is what the vegetation indicates about infrastructure upkeep. Small roots can exploit existing cracks, expansion joints, drainage gaps and construction defects, potentially allowing more water to enter and moisture to accumulate.

Water reaching reinforcing steel can cause corrosion. As rust expands, it can crack and damage the surrounding concrete.

Vegetation can also clog drainage systems with leaves, soil and roots, while larger roots may put pressure on edges, joints and retaining elements.

Experts call for regular inspections

Experts have recommended clearing vegetation before roots penetrate deeper, inspecting flyover joints at least once a year, sealing cracks, addressing leakages and acting promptly on seepage and damaged components.

Prof Ramachandra V, director of the RASTA Centre for Road Technology, said regular inspection and maintenance are essential for concrete structures such as flyovers and bridges.

Karnataka Council of Professional Civil Engineers president Shrikant S Channal also cautioned that vegetation affecting panels and their connections could weaken retaining systems.

GBA Commissioner Maheshwar Rao said the issue would be taken up under the authority’s annual maintenance plan.