On this page
Why Do We Call SIDRA Micro-Analytical?
The SIDRA model is termed micro-analytical because it provides a highly detailed, lane-based analysis of traffic intersections, incorporating multi-modal transportation, second-by-second vehicle movement patterns, and a four-mode elemental model for vehicle paths. Unlike traditional aggregate models, SIDRA focuses on individual lanes, vehicle types, and dynamic traffic conditions, offering precise insights into capacity, performance, and traffic flow.
Unique Lane-Based Model
SIDRA employs a lane-based approach for all traffic facilities, including intersections, interchanges, pedestrian crossings, arterial midblock segments, freeway segments, and ramps. Unlike traditional analytical models that use aggregated movement groups, lane groups, and approaches, SIDRA applies lane-by-lane techniques for:
- Input data collection
- Capacity and performance modelling
- Output presentation
Since traffic congestion and queuing occur at the lane level, this detailed analysis provides more reliable capacity and performance assessments for intersections and networks.
Powerful Multimodal Capacity and Performance Analysis
SIDRA supports multi-modal traffic analysis by considering different Vehicle Movement Classes, including:
- Light Vehicles
- Heavy Vehicles
- Buses
- Bicycles
- Large Trucks
- Light Rail / Trams
- Six User-Defined Vehicle Classes
- Pedestrian movements
For shared lanes with multiple movement classes, SIDRA’s shared lane capacity model integrates different vehicle capacities within a single lane, providing a realistic estimation of intersection performance.
Second-by-Second Platoon Patterns
SIDRA simulates second-by-second vehicle platoon patterns for signalised intersections within a network. These lane-based patterns are modelled separately for different vehicle movement classes, incorporating midblock lane changes to reflect real-world traffic behaviour.
Four-Mode Elemental Model
SIDRA applies a four-mode elemental model to simulate vehicle movement paths (drive cycles), consisting of:
- Cruise
- Acceleration
- Deceleration
- Idling
These elements are modelled for each lane and each vehicle class to estimate geometric delays, stop-start patterns, energy use, emissions, and operating costs. This lane-specific drive cycle modelling provides a more accurate representation of real-world traffic conditions.
Additionally, acceleration and deceleration models differ for Light and Heavy Vehicles, ensuring that SIDRA’s micro-analytical approach reflects real vehicle dynamics.
Learn More About SIDRA’s Fuel Consumption & Emissions Model →