https://ftp.dot.state.tx.us/pub/txdot-info/trf/trafficsafety/saving-lives.pdf
Texas Strategic Highway Safety Plan
https://ftp://ftp.dot.state.tx.us/pub/txdot-info/library/pubs/gov/shsp.pdf
Countermeasures That Work
https://www.nhtsa.gov/sites/nhtsa.dot.gov/files/812202-countermeasuresthatwork8th.pdf
Transportation Research Information Systems (TRIS)
http://www.trb.org/InformationServices/InformationServices.aspx
FHWA Proven Safety Countermeasures
https://safety.fhwa.dot.gov/provencountermeasures/