FHWA, MAP-21 Apportionment Fact Sheet
http://www.fhwa.dot.gov/map21/factsheets/apportionment.cfm

FHWA, HSIP Apportionment Notices
http://www.fhwa.dot.gov/legsregs/directives/notices/

FHWA, HSIP MAP-21 Fact Sheet
http://www.fhwa.dot.gov/map21/factsheets/hsip.cfm

FHWA, HSIP MAP-21 Reporting Guidance, February 13, 2013
http://www.fhwa.dot.gov/map21/guidance/guidehsipreport.cfm

FHWA, HSIP Online Reporting Tool
https://safety.fhwa.dot.gov/hsip/resources/onrpttool/

FHWA, HSIP National Summary Baseline Report 2009-2012
https://highways.dot.gov/safety/hsip/hsip-national-summary-baseline-report-2009-2012

FHWA, HSIP 2013 National Summary Report
https://highways.dot.gov/safety/hsip/hsip-2013-national-summary-report

FHWA, HSIP 2014 National Summary Report
https://highways.dot.gov/safety/hsip/hsip-2014-national-summary-report

FHWA, HSIP 2015 National Summary Report
https://www.fhwa.dot.gov/safety/legislative-safety-programs/hsip/hsip-2015-national-summary-report-0

2016 State HSIP Reports
https://www.fhwa.dot.gov/safety/legislative-safety-programs/hsip/reporting