Approximate Location of the Study Area

The approximate study region is circled in yellow on this map, which is adapted from the original (Zhao et al. 2017:3) by the addition of the yellow circle and its corresponding caption. The original image was used under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/).

References:

Zhao, H., Z. Yin, H. Xiang, Z. Liao, and Z. Wang. 2017. Preliminary study on alterations of altitude road traffic in China from 2006 to 2013. PLoS ONE 12(2):e0171090. doi:10.1371/journal.pone.0171090.