On a motorway, drivers make decisions on their speed. It has been shown that drivers change their acceleration only at specific times and not continuously. Lane changes are also made at discrete moments in time. This paper determines the moments when drivers change their acceleration and moments when they change lanes. Fitting longitudinal and lateral paths separately shows that the action points for lane changing are close to those of acceleration changes. Moreover, fitting them simultaneously shows that a comparable quality of description of the trajectory can be given under the restriction that lane changes are only considered at action points.