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External links
Signal References


AASHTO - American Association of State Highway and Transportation Officials
Center for Education and Research in Safety 
Federal Highway Administration 
IMSA - International Municipal Signal Association 
Manual on Uniform Traffic Control Devices 
NEMA - National Electrical Manufacturers Association
http://www.signaltiming.com/ 
Traffic Signal Association 
Wapiti Micro Systems 
Northwest Signal Supply, Inc
 
 
ITS References


ITE - Institute of Transportation Engineers 
ITS America
ITS Online 
NTCIP - National Transportation Communications for ITS Protocol
US Department of Transportation ITS Site
 
 
Training and Certification
 
IMSA Certification and Training
 
Mt Hood Community College 
 
Internetworking Technology Handbook 

Page updated: May 04, 2010