- Manual on Uniform Traffic Control Devices
https://mutcd.fhwa.dot.gov/
- NCDOT Specifications
https://connect.ncdot.gov/resources/specifications/pages/specifications-and-special-provisions.aspx
- ADA Standards for Accessible Design
https://www.ada.gov/2010ADAstandards_index.htm
- Carolina AGC
https://www.cagc.org/
- Arrowline Employment
https://drive.google.com/open?id=0BwyG04ZdzTSbSTVjMU95UWpSdTg