The Chinese contractor who was awarded the Bus Rapid Transport system project is making progress.
The BRT pilot was to start in June, but Namata director Francis Gitau said it has been pushed to February next year.
The Nairobi Metropolitan Area Transport Authority said the delay in the launch had been caused by the Covid-19 pandemic.
According to the government, the BRT buses will arrive in December; Namata is aiming for 60 electric buses.
Each bus can carry about 160 passengers and will use electronic cards for payment.
The Kasarani Sports Arena will have 130 parks and ride facilities for BRT. Construction is underway.
To ensure the BRT buses are not hindered by traffic, the inside lanes of Thika Super Highway will be demarcated and stations provided along the corridor.
Those with personal cars will park at Kasarani before boarding BRT buses.
The main depot for Line Three is at Kasarani, while other minor depots will be at Kenyatta National Hospital and Ruiru.
In November 2019, the government floated the BRT tender, saying it intends to improve the infrastructure of Thika Superhighway to accommodate the project.