The ‘upper seat indicator technology’ is likely to be welcomed by commuters on busy routes in the capital, with those using route 59 between King’s Cross and Streatham Hill set to be the first to benefit though the trial. It uses low-resolution photos to display a live diagram of the upper deck showing customers which seats are filled.

A display downstairs on the bus will provide a live diagram of the upper deck showing which seats are filled.

The idea is to encourage customers to go upstairs by showing them empty seats, relieving some of the crush on the lower deck of the busy route.

Simon Reed, head of TfL's technical services group, said: “We want passengers to benefit from the most cutting edge technology, making their journeys easier and more comfortable.

This project builds on a single vehicle trial conducted in 2014 and should provide a practical, clear benefit with clear information at the point of boarding.

“As we expand this trial we will be able to learn more about how it will work on a large scale and what kind of impact it will have on our passenger's experience.”

The kit has been developed with digital recording firm Timespace. Managing director Robert Heylen said: “We are delighted to be partnering with TfL on the development and trial of this new technology and hope it proves beneficial to bus passengers.”

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