bridge connect cross grey Inverness iron metal path pedestrian river span suspension towers walk water ampelmännchen berlin danger directions don't-walk pedestrians red sign signs stop street traffic-light background baum brick bricks ground pavement stones texture tile wall wallpaper walls access ascend blue climb elevator glass lift stair steel steps tower arch centre city contemporary dundee footpath modern over rail railway stylish tracks walkway Alley alleyway architecture home house narrow passage passageway Spain spanish Toledo town urban cables concrete overpass posts protection railing rails rods safety suspension bridge waterway lighting purple