Since commuting implies changing – perhaps moving from personal concerns to work-orientated matters – the significance is shifting from a relaxed to a more focused state.
Psychological / emotional perspective: Just as our mindset must change as we travel to and from work from personal to work concerns, substituting one way of thinking for another, in essence changing perspective, can lead to radical changes in lifestyle.
Material aspects: In modern-day life commuting has turned into a time of transition, a way of covering distance and a time for planning. Dreaming of such an occurrence can highlight any of these activities.
For further clarity see journey and transport.