Spiral Ramp Bridge: An Accessible Pathway Ascending in Circles

Render the approach to a pedestrian overpass resolved as a helical ramp, used where there is no room for a straight run at an accessible gradient. Show a continuous circular ramp coiling upward through roughly two and a half turns around a central open void, its gradient constant and gentle with a level landing at each full turn. Build the ramp as a curved reinforced concrete slab with a smooth soffit, its outer edge carrying a slim steel balustrade with vertical bars and a continuous timber handrail at two heights. Detail the central void as open to the sky with a single mature tree growing up through it from a planted bed at ground level. Show the ramp surface as a textured non-slip finish in a warm grey with a tactile strip at each landing. Detail the structure as a ring of slender columns just inside the outer edge. Show the bridge deck departing from the top level toward the road. Include people and a wheelchair user ascending. Show morning light striping the ramp through the balustrade. Photorealistic, sculptural, pale concrete and green, three-quarter view from below.