http://tti.tamu.edu/documents/0-6781-1
http://tti.tamu.edu/documents/0-6781-1.pdf
http://www.ntis.gov
http://ftp.dot.state.tx.us/pub/txdot
http://ftp.dot.state.tx.us/pub/txdot
http://tti.tamu.edu/documents/0-6103-1.pdf
https://rip.trb.org/view/2011/P/1303806
http://transportation.ce.gatech.edu/workzone
http://mutcd.fhwa.dot.gov/reqdetails.asp?id=950
http://www.intrans.iastate.edu/smartwz/
http://ntl.bts.gov/lib/10000/10500/10530/traffic.pdf
http://www.oregon.gov/ODOT/
http://tti.tamu.edu