RFC 2331
ATM Signalling Support for IP over ATM - UNI Signalling 4.0 Update. M. Maher. April 1998.
http://tools.ietf.org/html/rfc2331

Traffic Control Devices, Inc.
Installers and maintainers of traffic signal equipment, signs, and intelligent transportation systems. Includes contact locations and employment opportunities.
http://www.trafficcontroldevices.com/

Theory of Honest Signalling
Costly signalling and Zahavi's handicap principle in animal communication: sexual selection, signalling among relatives, and in human communication.
http://octavia.zoology.washington.edu/handicap/

Cellular Signalling
Papers covering all aspects of mechanisms, actions and structural components of cellular signalling systems.
http://www.elsevier.com/wps/find/journaldescription.cws_home/525462/description

Railway Signalling Design Training for the UK
UK signalling design courses and other related services for the UK rail industry.
http://www.peak-ict.co.uk/

Peek Traffic Inc.
Quality devices for loop detection and ADR counter/classifiers. Red light enforcement, and tolling for all your traffic enforcement and problem solving needs.
http://www.peektrafficinc.com/

This Is a Recording
Hundreds of telephone sounds and recordings including error recordings, signalling, colored box tones, and devices.
http://www.thisisarecording.com

Adaptive Recognition Hungary
Manufactures and sells devices that process images for purposes of security and traffic control, including license plate reading technology for parking and high-velocity traffic applications.
http://www.arhungary.hu/

Traffic Calming
We plan, build, manage and maintain an effective and safe transportation system that provides people and businesses access and mobility.
http://www.trans.ci.portland.or.us/trafficcalming/default.htm

Mikko Juusola
studies processing in visual neurons of Drosophila as well as effects of molecular components on neural computations and sensory adaptation. Influence of rearing and environment on signalling is studied and signalling during natural stimulation is analyzed and modeled.
http://www.shef.ac.uk/bms/research/juusola