Clarification of speed definition necessary

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From the user guide/UML it is not clear how the term 'speed' is defined mathematically. 'Speed' is used at several places in the UML/User guide. As an example: for LongitudinalAction -> SpeedActionTarget -> AbsoluteSpeedTarget, a combination of longitudinal and absolute is present. This is misleading and it is not clear which definition of speed is expected, either an absolute speed (Euclidean 2-norm of the motion vector or any other definition?) or a speed along any longitudinal direction (in that case it would be necessary to specify which coordinate system should be applied to make 'longitudinal' unique). Note that if an Euclidean speed is intended it might interact/contradict actions that are active in any lateral dimension at the same time.

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Please clarify all mathematical definitions like speed/acceleration (scalar vs vector-valued quantities) and clarify their side-effects with other actions/conditions that dependent on a spatial dimension