Comparing drivers' self-perception on driving behaviour changes with real world driving performance data: Lisbon case-study

The majority of drivers perceived their behaviour suffered 'little' to 'some changes', particularly in fuel consumption and aggressiveness. The comparison with driving data revealed that drivers increased the incidence of unwanted behaviours when they considered that their performance suffered 'some changes'. On the contrary, decreases in some indicators, such as aggressiveness, speeding and excess rpm, were observed when 'no changes' were perceived by the drivers. These results are indicative that drivers are not correctly aware of changes in their performance.