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‘ttc’ develop VISSIM models for Nairobi BRT System

Updated: Mar 1, 2019



Following the successful development of a VISUM multi-modal transport model for the Nairobi Bus Rapid Transit (BRT) Lines 3 and 4W Schemes, “ttc” have been asked to complete further transport modelling by creating a series of VISSIM models.

As part of the ‘Transport Forecast Demand Modelling’ role being undertaken by “ttc” for the BRT System, they were requested to develop a series of ‘VISSIM’ Micro-Simulation Traffic Models. The models cover a section of the Ngong Road to the west of the city centre - between The Prestige Shopping Centre and The Kenyatta National Hospital. The section spans a distance of 2.4 km and includes a number of complex junction arrangements.


The VISSIM models were established from the original Nairobi BRT VISUM Multi-Modal Transport model which predicted passenger demand and revenue forecasts (developed by ‘ttc’) for the Nairobi BRT System - and then used to develop and assess several BRT alternative running options running between the two locations.

What did the ‘VISSIM’ micro-simulation traffic model show us?

Alan Bailes, Director at “ttc” says, “The VISSIM microsimulation traffic models are designed to simulate the effects of alternative forms of BRT running lanes on road capacity and junction operation. The findings from the particular VISSIM models enabled us to make informed decisions about the best way to deliver the BRT scheme along this particular section of Ngong Road.”

Want to know more about the BRT Scheme in Nairobi?

'ttc' have been working on the Nairobi Bus Rapid Transit (BRT) system scheme since 2015 as part of an International Consortium. The role of ‘ttc’ within the consortium is to provide passenger demand and revenue forecasts for the BRT scheme and assist with the general specification for the system.

Read more about the Nairobi BRT System or contact us to discuss your BRT challenges.

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