Overview
TTAP runs both SIDRA and AIMSUN model platforms — SIDRA for targeted, isolated intersection modelling; AIMSUN for connected networks with dynamic continuity between intersections, route-choice behaviour, queue spillback and driver behaviour simulation. Choosing the right tool for the question matters: SIDRA is faster and cheaper for an isolated roundabout signal; AIMSUN is essential where congestion propagates across a corridor.
SIDRA project examples
Fred Taylor Dr / Pua Street / Matakohe Rd, Westgate (AT); Edmonton Rd / Matahui Rise, Henderson (AT); Industry Rd / South Lane (AT); Helston Rd / Stewart Dr Model Review (WCC); Watercare Pukekohe Project (AT); Parr Road Bus Signal Installation.
AIMSUN project examples
Mangawhai Traffic Modelling (Kaipara DC); Cannon Point 287 Lots Subdivision (Upper Hutt CC); Harbour Quay (WCC); Favona Road (AT); Cavendish Drive (AT); Totara Park / SH2 (Upper Hutt CC); Parr Road Bus Signal Installation (AT); Onehunga Masterplan (AT); Bader Drive / Robertson Rd Roundabout (AT).
Why both
Choosing modelling tools to fit the question — not the other way around — means we don’t oversell complexity or under-deliver evidence. Both platforms feed the same intersection performance metrics (LoS by movement, delay, travel time, queue length, network speed) so business cases can compare options on like-for-like terms.
Team
Bob Hu (Managing Director / Principal Traffic Engineer) leads the modelling portfolio and holds the long-standing AT, WCC, Upper Hutt and Kaipara relationships. Stu Zhang (Transport Modeller / Assets Analyst) is the day-to-day modelling lead — model build, calibration, validation and assessment across both SIDRA and AIMSUN platforms. Wendy Li (Project Manager / Transport Planner) coordinates each model brief through to business-case integration.
For modelling work on your network, talk to us.