Sidra Intersection

The SIDRA INTERSECTION software is an advanced micro-analytical traffic evaluation tool for use as an aid for design and evaluation of individual intersections and networks of intersections.

Unlike traditional network models that use aggregate models of "links" or "lane groups", SIDRA INTERSECTION uses a lane-based model to create second-by-second platoon arrival and departure patterns for signalised Sites (at-grade intersections, interchanges, pedestrian crossings) to calculate signal coordination effects as a function of signal offsets for internal approaches in network analysis.

It can be used to analyse signalised intersections (fixed-time / pretimed and actuated), signalised and unsignalised pedestrian crossings, roundabouts (unsignalised), roundabouts with metering signals, fully-signalised roundabouts, two-way stop sign and give-way / yield sign control, all-way stop sign control, single point interchanges (signalised), freeway diamond interchanges (signalised, roundabout, sign control), diverging diamond interchanges. It can also be used for uninterrupted traffic flow conditions and merge analysis.

Key Benefits & Features

  • Analyse any network with up to 20 sites including roundabout corridors, a mixture of signalised intersections, roundabouts and sign control, and so on
  • Use diverse movement classes including Standard Movement Classes (Light Vehicles and Heavy Vehicles, Buses, Bicycles, Large Trucks, Light Rail / Trams) and User Classes to analyse bus lanes and phases, bicycle lanes and phases, the effect of heavy vehicles on intersection capacity and performance, and so on
  • obtain estimates of capacity and performance characteristics such as delay, queue length, stop rate as well as operating cost, fuel consumption and pollutant emissions for all intersection types
  • analyse many design alternatives to optimise the intersection and network geometry, signal phasing and timings specifying different strategies for optimisation
  • handle intersections with up to 8 legs, each with one-way or two-way traffic, one-lane or multi- lane approaches, and short lanes, slip /bypass lanes, continuous lanes, turn bans, U turns, contra flow lanes as relevant
  • determine signal timings (fixed-time / pretimed and actuated) for any intersection geometry allowing for simple as well as complex phasing arrangements
  • carry out a design life analysis to assess impact of traffic growth
  • carry out a parameter sensitivity analysis for calibration, optimisation, evaluation and geometric design purposes
  • design intersection geometry including lane use arrangements taking advantage of the unique lane-by-lane analysis method of SIDRA INTERSECTION for individual sites and networks
  • determine short lane lengths (turn bays, lanes with parking upstream, and loss of a lane at the exit side)
  • analyse complicated cases of shared lanes and opposed turns (e.g. permissive and protected phases, slip lanes, turns on red)
  • analyse oversaturated conditions making use of the time-dependent delay, queue length and stop rate models used in SIDRA INTERSECTION

Case Studies

Some of our industry wise featured case studies