AVOT Vision
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AVOT Vision

London Underground Driver testing

Based on the results of this study, TfL designed a colour assessment protocol based exclusively on the CAD test. The new approach to colour assessment ensures that up to a third of people who would have previously been prevented from working as train drivers are now passed fit.

At TfL, the safety critical part of a train driver’s assessment is red/green vision – a number of coloured light signals of well-defined spectral composition are involved. Blue/yellow vision is also important and is part of the assessment to check for eye health.

A detailed description of how the CAD test is used in the TfL environment is given in an article written by John Ballard (Editor, Occupational Health at Work Journal).

Read John Ballard's article about the use of CAD in the TfL environment.

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City, University of London

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London EC1V 0HB

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City, University of London is an independent member institution of the University of London. Established by Royal Charter in 1836, the University of London consists of 18 independent member institutions with outstanding global reputations and several prestigious central academic bodies and activities.