1. School of Information Engineering, Chang’an University, No. 435, The Middle Section of South 2nd-Ring Road, Xi’an, Shaanxi 710064, China
2. Department of Civil and Environmental Engineering, University of California, Davis, 3145 Ghausi Hall, One Shields Avenue, Davis, CA 95616, USA
3. California Department of Transportation, Division of Maintenance, Headquarters, 2389 Gateway Oaks Drive, No. 200, MS 91, Sacramento, CA 958833, USA