<PERSON>. 29.54 This series of images from Lanzhou, China, demonstrates how a tracking survey is used to inform the location of a BRT station. The top image shows the existing roadway. The middle image overlays a tracking survey (the smallest line represents 10 people, while the largest is 500). As shown, some people cross at the designated crosswalks, while many cross elsewhere, such as at intersections and where small streets intersect the larger road. The last image shows the BRT station and proposed crosswalks, which try to accommodate as many of the crossing patterns as possible.