The vertical transportation system of a building is one of the most consequential design decisions an architect, engineer, or developer will make. Get it right and occupants move efficiently, floor space is used optimally, and the building functions smoothly for its intended purpose. Get it wrong and the consequences are immediate and long-lasting: queues at lift lobbies, frustrated occupants, landlords facing complaints, and the near-impossibility of remediation once a building’s core is committed to a specific lift configuration.
The tools used to model, analyse, and optimise lift systems before construction have advanced considerably in recent decades, and the gap between those who use specialist software and those who rely on manual calculation or intuition has never been wider. For building professionals serious about getting vertical transportation right, AdSimulo lift traffic analysis and simulation software represents the current state of the art — combining traffic analysis, expert system optimisation, 3D visualisation, and BIM output in a single integrated platform.
Why Lift Traffic Analysis Matters
Lift traffic analysis is the discipline of modelling how passengers will move through a building’s vertical transportation system under various demand conditions. Its purpose is to determine whether a proposed lift configuration — the number of lifts, their capacity, their speed, their dispatch algorithm — will serve the building’s population adequately during peak demand periods, and to identify the most efficient configuration for the specific building type and occupancy profile.
The consequences of inadequate lift traffic analysis are felt most acutely during morning and lunchtime peaks in office buildings, during arrival and departure peaks in residential towers, and during high-density event periods in hotels and mixed-use developments. In each case, the demand placed on the lift system is predictable if modelled correctly, and the resulting queues, waiting times, and occupant frustration are entirely preventable with the right analysis at the design stage.
The challenge is that lift traffic behaviour is genuinely complex. Passenger arrival patterns vary by building type, floor population, time of day, and the specific traffic control system deployed. The interaction between multiple lifts serving multiple floors with varying passenger volumes produces a system-level behaviour that is difficult to model accurately with simplified hand calculations. Simulation-based analysis, which models individual passenger journeys through a statistical representation of the building’s population and demand patterns, produces significantly more accurate predictions than the simplified calculation methods that have historically dominated the field.
From Calculation to Simulation: The Evolution of Lift Traffic Analysis
The development of lift traffic analysis as a formal discipline is documented in CIBSE’s authoritative guidance for building professionals. CIBSE Guide D: Transportation Systems in Buildings has been the definitive reference for UK and international practice for decades, providing the theoretical framework and calculation methods that underpin professional lift traffic analysis.
Traditional calculation-based methods, which use simplified traffic models to estimate handling capacity and average waiting times, remain useful for initial feasibility assessment and for straightforward building types where the assumptions underlying the calculations are well-matched to the actual building profile. Their limitation is that they cannot fully capture the complexity of multi-lift systems, non-standard traffic patterns, or the performance of modern destination dispatch control systems that route passengers to specific lifts before they reach the lobby.
Simulation-based analysis addresses these limitations by modelling the behaviour of the lift system directly, running thousands of virtual passenger journeys through a digital model of the building and its lift configuration to produce statistical performance outputs that reflect the system’s actual behaviour far more accurately than simplified calculations can achieve.
What Lift Design Software Should Do
Professional lift design software serves multiple functions across the design process, from initial concept through detailed specification to client presentation and BIM integration. Understanding what the best tools provide across each of these functions helps building professionals select the software that genuinely serves their workflow.
At the analysis and optimisation stage, the software should be capable of running rapid simulations across a range of lift configurations to identify the optimal solution for the specific building. The best tools include an expert system that automates this optimisation process, testing thousands of configurations against the building’s parameters to recommend the solution that best balances performance, space, and cost objectives. This automation transforms what would otherwise be a time-consuming manual process into a rapid, systematic analysis that can be completed in minutes.
Reporting is a critical output. A professionally specified lift system requires comprehensive documentation of the traffic analysis that supports the design recommendation, covering the building parameters used, the performance criteria applied, the configurations evaluated, and the predicted performance of the recommended solution under various demand conditions. Automated report generation that produces client-ready documentation directly from the analysis results is a significant practical advantage.
BIM integration has become essential as the industry has adopted Building Information Modelling as the standard framework for building design and coordination. Software that outputs lift system geometry in IFC format, ready to be incorporated into the project’s overall BIM model, eliminates the duplication of effort that occurs when lift designers and BIM coordinators work from separate information sources.
The Expert System Advantage
The most significant advance in lift design software in recent years has been the development of expert system functionality that automates the optimisation process. Traditional simulation tools require the user to define the specific configuration to be analysed and then interpret the results, repeating the process iteratively until a satisfactory configuration is found. Expert systems instead accept the building’s parameters as input and systematically evaluate a large number of potential configurations to identify the optimal solution automatically.
This approach produces several benefits. It ensures that the optimisation process is genuinely comprehensive rather than being limited by the designer’s intuition about which configurations are worth evaluating. It produces a defendable, auditable recommendation that is based on systematic analysis rather than professional judgement alone. And it dramatically reduces the time required to arrive at an optimised design, freeing the engineer or consultant to focus on the aspects of the design that genuinely require professional judgement.
Final Thoughts
Lift traffic analysis and lift design software are no longer specialist concerns for large, complex projects only. As buildings become taller, urban density increases, and occupant expectations for vertical transportation performance rise, the case for rigorous, simulation-based analysis applies across a broader range of building types and scales. For building professionals looking to raise the standard of their vertical transportation design, investing in the right lift design software is one of the highest-value decisions available at the early stages of a project.
