Hazard detection: testing the caveats of previous studies

Detecting pavement irregularities that might lead to a fall if not seen in sufficient time is one of the critical visual tasks of pedestrians. Experiments have been conducted to determine how the detection of peripheral objects, at mesopic light levels, is affected by light level and spectrum, leading to proposals for new guidance. As with all experimental work, there are caveats to application of the findings in practice - limitations regarding the context in which the experiment was conducted. This paper presents three experiments carried out to explore those caveats.