angles appearance background beams below beneath bridge concrete deck girders light lower lower-deck perspectives piers pillars reflections secure solid steel strength strong structure structures surface surfaced surfaces texture textured textures thick under undercover water fishermen fishing river support supportive underside boat dinghy tinnie alternative alternative-energy alternative-power alternatives clouds dark darkening energy exterior external glass lamp lamp-post lamppost lighting lights outdoor outdoors path protected protection protective renewable safety security shapes shine sky solar solar-panels styles adelaide angle arched barrier bright curved footbridge handrail overpass park patterns peaceful pedestrian perspective posts public park railing rails recreation recreational area relaxing river-crossing shadow shadows sunlight sunshine walkway waterway appearances caged contained cover covered freeway mesh metal public ribbing roof roofing safe shelter sheltered tunnel tunnelled