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Sidra Intersection: History & Products
Sidra Intersection (styled SIDRA, previously called Sidra and aaSidra) is a software package used for intersection (junction), interchange and network capacity, level of service, performance and traffic impact analysis, and signalised intersection, interchange and network timing calculations by traffic design, operations and planning professionals.
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Sidra Intersection topic overview
The analysis highlights History and Products as prominent areas in the source structure around Sidra Intersection.
Related topics
31
Source areas
6
Connected nodes
37
Extracted relationships
109
Concept neighborhoods
13
Bridge connections
37
What this topic covers Research coverage
Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.
History · 15 topics
Emissions and energy · 10 topics
Scientific foundation and awards · 3 topics
Model calibration · 1 topics
Overview · 1 topics
Roundabouts · 1 topics
Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.
Key facts & relationships
High-confidence facts extracted from structured source data. Use them as anchors for further research.
Developers
Akcelik and Associates Pty Ltd (trading as Sidra Solutions)
License
Proprietary
Operating system
Windows
Release
1984; 42 years ago (1984)
Stable release
11.0.2.66 / 31 March 2026; 4 months ago (2026-03-31)
Type
Micro-analytical traffic evaluation tool for intersection, interchange and network design, traffic assignment, operations, planning and signal timings.
Explore all related topics Closing gaps
A structured outline of related entities, concepts and subtopics. Open any item to build a new map centered on it.
Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.
Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.
How Sidra Intersection connects Entity context
Entity context groups extracted connections by relationship type. Counts show recurrence in the analyzed source; the examples are research signals, not claims about importance.
The extracted context around Sidra Intersection shows recurring relationship patterns in the source. For example, Sidra Intersection → As, Extended, Fully, HCM, HCM Edition, It, Metering, MUTCD, NCHRP, NCHRP Report, Roundabout Informational Guide, Roundabout Metering, Roundabout Practice, SIDRA Standard, The, The HCM, TRB/FHWA, US, US HCM, US Transportation Research Board Another extracted example is Sidra Intersection → Akcelik, AMP Innovation Award, Associates, Australia, Australian Road Research Board, Clunies Ross National Science, Dr Rahmi Akcelik, Frederick, Governor, Highway Capacity Manual, Institute, Memory, Technology, Telstra Business Awards, The, Thus Sidra Intersection, Transportation Energy Conservation Award, Transportation Engineers, USA, Victoria Export Awards. Use these groups to spot repeated connection types before inspecting the individual relationships.
Sidra Intersection
Top relations
related to Roundabouts· 22
Sidra Intersection → As, Extended, Fully, HCM, HCM Edition, It, Metering, MUTCD, NCHRP, NCHRP Report, Roundabout Informational Guide, Roundabout Metering, Roundabout Practice, SIDRA Standard, The, The HCM, TRB/FHWA, US, US HCM, US Transportation Research Board
related to Scientific foundation and awards· 22
Sidra Intersection → Akcelik, AMP Innovation Award, Associates, Australia, Australian Road Research Board, Clunies Ross National Science, Dr Rahmi Akcelik, Frederick, Governor, Highway Capacity Manual, Institute, Memory, Technology, Telstra Business Awards, The, Thus Sidra Intersection, Transportation Energy Conservation Award, Transportation Engineers, USA, Victoria Export Awards
related to Highway capacity manual· 10
Sidra Intersection → Chapter, HCM, HCM Edition, Highway Capacity Manual, Metric, The, The Highway Capacity Manual, The US HCM, US, US Customary
related to Model calibration· 10
Sidra Intersection → Among, At, Customary, Highway Capacity Manual, In, It, Metric, US HCM, US Highway Capacity Manual, User Guide
related to Performance measures· 9
Sidra Intersection → Extensive, Level, LOS, LOS Target, Movement Classes, Performance, Service, Standard, The Interactive Offsets
related to Emissions and energy· 6
Sidra Intersection → CO, CO2, HC, NOx, The, This
has method· 5
Sidra Intersection → Common Control Group, EQUISAT, In, Network, The
is a· 2
Sidra Intersection → micro-analytical traffic evaluation tool that employs lane-by-lane and vehicle drive cycle models, most widely used software tool in the US for roundabout analysis as reported in the US Transportation Research Board document titled Roundabout Practice
related to Lane-based intersection and network analysis method· 2
Sidra Intersection → Intersections, The
Developers· 1
Sidra Intersection → Akcelik and Associates Pty Ltd (trading as Sidra Solutions)
Important terminology
Frequent words and multi-word phrases across the lead, headings, infobox and body. Useful for terminology coverage.
Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.
Relationships are represented as Subject → Predicate → Object triples. Confidence describes extraction strength, not the real-world importance of a relationship; lower-confidence rows may be contextual rather than explicit.
TTTA extracted 109 structured relationships around Sidra Intersection. Examples in this analysis include Sidra Intersection → Developers → Akcelik and Associates Pty Ltd (trading as Sidra Solutions) and Sidra Intersection → License → Proprietary. The table shows each extracted connection, where it came from and its confidence.
Subject
Predicate
Object
Confidence
Src
Sidra Intersection
Developers
Akcelik and Associates Pty Ltd (trading as Sidra Solutions)
1.00
infobox
Sidra Intersection
License
Proprietary
1.00
infobox
Sidra Intersection
Operating system
Windows
1.00
infobox
Sidra Intersection
Release
1984; 42 years ago (1984)
1.00
infobox
Sidra Intersection
Stable release
11.0.2.66 / 31 March 2026; 4 months ago (2026-03-31)
1.00
infobox
Sidra Intersection
Type
Micro-analytical traffic evaluation tool for intersection, interchange and network design, traffic assignment, operations, planning and signal timings.
1.00
infobox
Sidra Intersection
Website
sidraintersection.com
1.00
infobox
Sidra Intersection
is a
micro-analytical traffic evaluation tool that employs lane-by-lane and vehicle drive cycle models
0.90
text
Sidra Intersection
is a
most widely used software tool in the US for roundabout analysis as reported in the US Transportation Research Board document titled Roundabout Practice
0.90
text
diverging diamond interchanges
instance of
and alternative intersection and interchange configurations
0.80
text
delay
instance of
Standard performance measures
0.80
text
queue length
instance of
Standard performance measures
0.80
text
No triples extracted yet.
Related concept clusters Concept neighborhoods
Concept neighborhoods group terms that sit near one another in the extracted graph. They are useful for discovering adjacent language and context, but proximity does not by itself imply a factual relationship.
The concept neighborhoods around Sidra Intersection bring nearby vocabulary together. In this analysis, examples include Sidra, Capacity and Tool. Use the clusters to find adjacent concepts and terminology that may deserve separate research.
Sidra Intersection
Sidra
Capacity
Tool
Us
Analysis
Software
Highway
Manual
Roundabout
Model
Hcm
Signalised
sidra intersection
Sidra
Capacity
Analysis
Tool
Us
Includes
Software
Highway
Manual
Roundabout
Model
Hcm
intersection
Sidra
Analysis
Capacity
Includes
Highway
Manual
Tool
Us
Roundabout
Signalised
Roundabouts
Software
traffic model
Network
Hcm
Roundabout
Method
Model
Traffic
Sidra
Roundabouts
Lane
Signal
Tool
Introduced
signal timing
Signal
Timing
Timings
Methods
Intersections
Method
Lane
Lanes
New
Includes
Signalised
Movement
signalised intersections
Networks
Intersections
Signalised
Roundabouts
Timings
Methods
Signal
Lane
Timing
Network
Used
Includes
highway capacity manual
Manual
Hcm
Highway
Us
Roundabout
Sidra
Intersection
Software
Method
Model
Tool
Various
modal analysis
Timing
Performance
Intersection
Used
Method
Methods
Signal
Software
Allows
Sidra
Capacity
Roundabouts
Connections between topic areas Semantic bridges
Semantic bridges connect parts of the graph that would otherwise be more separate. A bridge is a structural signal in this analysis, not a claim that the two topic areas are equivalent.
For Sidra Intersection, one of the stronger structural bridges in this analysis connects Sidra Intersection with History. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.
Min side: 3
Sidra Intersection — History· splits 22 ⟂ 16Sidra Intersection — Emissions and energy· splits 27 ⟂ 11Sidra Intersection — Scientific foundation and awards· splits 34 ⟂ 4
Map overview Semantic statistics
Number of nodes, edges, triples, density and central hubs. Use it to gauge the size and connectivity of the map.
Sidra Intersection
Nodes38
Edges37
Triples109
Avg. degree1.95
Density0.052632
Components1
Source & methodology
TTTA analyzes the structure around Sidra Intersection to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History & Products, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.
