AASHTO, Strategic Highway Safety Plan, 2005.
https://store.transportation.org/
FHWA, HSIP Apportionment Notices
https://www.fhwa.dot.gov/legsregs/directives/notices/
FHWA, HSIP Reporting Guidance, May 15, 2009.
https://www.highways.dot.gov/safety/legislative-safety-programs/hsip/highway-safety-improvement-program-reporting-guidance-0
FHWA, HSIP Online Reporting Tool
http://www.fhwa.dot.gov/legislative-safety-programs/hsip/hsip-online-reporting-tool
OIG, FHWA Provides Sufficient Guidance and Assistance to Implement the Highway Safety Improvement Program but Could Do More to Assess Program Results. Report Number: MH-2013-055. March 26, 2013.