FHWA, MAP-21 Apportionment Fact Sheet
https://www.fhwa.dot.gov/map21/factsheets/apportionment.cfm
FHWA, HSIP Apportionment Notices
https://www.fhwa.dot.gov/legsregs/directives/notices/
FHWA, HSIP MAP-21 Fact Sheet
https://www.fhwa.dot.gov/map21/factsheets/hsip.cfm
FHWA, HSIP MAP-21 Reporting Guidance, February 13, 2013
https://www.fhwa.dot.gov/map21/guidance/guidehsipreport.cfm
FHWA, HSIP Online Reporting Tool
http://www.fhwa.dot.gov/safety/legislative-safety-programs/hsip/hsip-online-reporting-tool
FHWA, HSIP National Summary Baseline Report 2009-2012
https://www.fhwa.dot.gov/safety/legislative-safety-programs/hsip/hsip-national-summary-baseline-report-2009-2012-0
FHWA, HSIP 2013 National Summary Report
https://www.fhwa.dot.gov/safety/legislative-safety-programs/hsip/hsip-2013-national-summary-report-0
2014 State HSIP Reports
https://highways.dot.gov/safety/hsip/hsip-state-reports-2014