Garden director Suyanee Vessabutr said yesterday this 400-metre-long steel-body walkway rises 20 metres above ground. On the walkway, there are several small |balconies whose floors are made of glass so 4-5 visitors at a time could stand on and admire the panoramic view or take pictures. Guides would also be on hand to provide related botanical knowledge, she said, adding the walkway would allow up to 40 visitors per time. The garden would allow free access to this walkway during this first period, she added.