Explain the uses of unidirectional verbs of motion

Unidirectional verbs of motion denote movement in one particular direction, usually on one occasion often with a named destination. The movement is not necessarily in a straight line but in all instances the verb advances the subject or object along a line of progression. The destination or direction of the movement does not need to be specified to any particular degree; destinations can be unspecified, precisely specified (eg. a specific place) or generally specified (eg. a point of the compass). Unidirectional verbs of motion can be used to express repeated actions where movement in one direction is stressed or where focus is on actions or processes occurring in sequence.