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Sidra Intersection (styled SIDRA, previously called Sidra and aaSidra) is a software package used for intersection (junction), interchange and network capacity, level of service and performance analysis, and signalised intersection, interchange and network timing calculations by traffic design, operations and planning professionals.
An early traffic engineer Henry Barnes, who served as Commissioner of Traffic in many cities including Baltimore, Maryland and New York City, developed coordinated traffic signal timings, so that large amounts of traffic could be accommodated on major traffic arterials. Traffic signal timing is a very complex topic.
The use of the software spread mainly by word of mouth within the traffic signals profession becoming widely used by signal engineers. The LinSig traffic modelling was based on standard 'Y' value hand calculations [4] which were widely used at the time for manually calculating traffic signal capacities and delays. This allowed the results of ...
The scope of application ranges from various issues of traffic engineering (transport engineering, [2] transportation planning, signal timing), public transport, urban planning over fire protection (evacuation simulation) to 3d visualization (computer animation, architectural animation) for illustrative purpose and communication to the general public.
Split Cycle Offset Optimisation Technique (SCOOT) is a real time adaptive traffic control system for the coordination and control of traffic signals across an urban road network. Originally developed by the Transport Research Laboratory [ 1 ] for the Department of Transport in 1979, research and development of SCOOT has continued to present day.
An emergency management system reporting an incident to a freeway management system, to a traffic signal management system, to two transit management systems and to a traveler information system; A freeway management system informing an emergency management system of a warning message just posted on a dynamic message sign on the freeway in ...
This allows higher traffic loads, and reduces noise and energy use (because less acceleration and braking is needed). In practical use, only a group of cars (known as a "platoon", the size of which is defined by the signal times) can use the green wave before the time band is interrupted to give way to other traffic flows.
Traffic actuated signal systems use detectors to adjust timing for: Only the main street - semi-actuated system; Both main and cross streets - fully actuated system. The above method is primitive real-time signal optimization at best. This method will optimize one traffic signal at a time.