1. National Transportation Safety Board. "Collision of Northeast Illinois Regional Commuter Railroad Corporation (METRA) Train and Transportation Joint Agreement School District 47/155 School Bus at Railroad/Highway Grade Crossing in Fox River Grove, Illinois, on October 25, 1995". PB96-916202 NTSB/HAR-96/02. Washington, D.C. http://www.ntsb.gov/doclib/reports/1996/har9602.pdf
2. United States Department of Transportation, Federal Railroad Administration Safety Advisory 2010-02. Federal Register. Volume 75, Number 190. Friday, October 1, 2010. http://www.fra.dot.gov/downloads/safety/sa201002.pdf
3. United States Department of Transportation Federal Railroad Administration National Highway-Rail Grade Crossing Inventory database. http://safetydata.fra.dot.gov/OfficeofSafety/publicsite/crossing/crossing.aspx
4. Traffic Signal Installation and Maintenance Manual. Institute of Transportation Engineers. 1989.
5. Traffic Signal Maintenance Manual, Institute of Transportation Engineers, 2010.
6. Code of Federal Regulations. Title 49 Part 234 Subpart D. http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=647ff67a5d9d8ca901d518b082942094&rgn=div6&view=text&node=49:4.1.1.1.28.4&idno=4
7. Manual on Uniform Traffic Control Devices. 2009 Edition. FHWA. http://mutcd.fhwa.dot.gov/pdfs/2009/pdf_index.htm
8. 1570 IEEE Standard for the Interface Between the Rail Subsystem and the Highway Subsystem at a Highway Rail Intersection. IEEE. 18 October 2002.
9. AREMA Communications and Signals Manual. Revised 2008. http://www.arema.org/publications/cs/index.aspx
10. Traffic Engineering Handbook, 6th Edition, Institute of Transportation Engineers, 2009.
11. Traffic Control Devices Handbook, 2001. Institute of Transportation Engineers.
12. Railroad-Highway Grade Crossing Handbook - Revised Second Edition August 2007. FHWA. http://safety.fhwa.dot.gov/xings/com_roaduser/07010/sec06.htm; http://safety.fhwa.dot.gov/xings/com_roaduser/07010/sec07.htm

 
OTHER RESOURCES

13. "Highway-Rail Crossing Program". FRA. http://www.fra.dot.gov/rrs/pages/fp_86.shtml
14. "Technical Standards and Inspection, Testing and Maintenance Requirements". Part D - Maintenance, Inspection, and Testing. Transport Canada. DRAFT October 24, 2002. http://www.tc.gc.ca/media/documents/railsafety/StdErv12.pdf
15. Mn/DOT Traffic Signal Timing and Coordination Manual. Guidelines for Inspection and Operation of Railroad Preemption at Signalized Intersections. May 2011. http://www.dot.state.mn.us/trafficeng/publ/signaloperations/2011_Timing%20&_Coordination_Manual2011.pdf
16. "Guideline For Inspecting and Testing Preemption of Interconnected Traffic Control Signals and Railway Crossing Warning Systems." TP 13755. Transport Canada. http://www.tc.gc.ca/media/documents/railsafety/TP13755.pdf
17. "Mn/DOT Annual Traffic Signal and Railroad Preemption Inspection Form". Version 11/21/2007. http://www.dot.state.mn.us/trafficeng/signals/signalworksheets.html
18. "North Carolina Department of Transportation Highway-Railroad Interconnection and Preemption Inspection Form". July 2007. http://www.ncdot.org/doh/preconstruct/traffic/itss/docs/RRForm.pdf
19. "State of Nevada Department of Transportation Railroad Safety Diagnostic Review Form". http://safety.fhwa.dot.gov/xings/com_roaduser/07010/appengform2.pdf
20. "Strategies for Improving the Project Agreement Process Between Highway Agencies and Railroads". SHRP2 Report S2-R16-RR-1. Executive Summary and Appendix C. http://onlinepubs.trb.org/onlinepubs/shrp2/SHRP2_S2-R16-RR-1.pdf
21. Preliminary Document - Texas Department of Transportation. http://safety.fhwa.dot.gov/xings/com_roaduser/07010/appeng.htm
22. EEE 1570 User Guide for Advanced System Controllers ASC/3, Econolite Control Products, Inc. 4 December 2009.