The seasonality of registrations has been modified, by increasing the gross registrations in spring and by reducing them in summer, since the abolition of the year rule, as decided at the start of the year 2000.

Three indicators are calculed:
- New private vehicle registrations;
- New households vehicle registrations (60% of private vehicle);
- The rest of private vehicle (cars companies).

This consumption is estimated using an econometric method:Calibration-adjustment, which establishes a relationship between the indicators used and automobile consumption.