Debiasing time saving judgements by manipulation of speed display

Abstract

The time saving bias predicts that when increasing speeding from a high speed (e.g. 100 kph) the time saved is overestimated and underestimated when increasing speed from a slow speed (e.g. 30 kph). An alternative meter indicating the inverted speed (min/km) was used to debias time saving judgements in an active driving task. The simulated driving task was to first drive a distance at a given speed and then drive the same distance again at the speed the driver judged was required in order to gain exactly three minutes in travel time compared to the first drive. A control group performed the same task with a speedometer and saved less than the targeted three minutes when increasing speed from a high speed and more than three minutes when increasing from a low speed, as predicted by the time saving bias. Participants in the alternative meter group were closer to the target. The study shows that biased intuitive judgements can be affected by changing information format.

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