transportation planner sarah riedel believes that companies need to encourage employees to take alternate means of transportation and telecommuting opportunities as well as reward employees who take advantage of these offerings

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Parallel structure is present in a text when the writer uses the same pattern of words, grammatical form, and tense to indicate two or more ideas have equal importance or are interrelated. It provides thoroughness and clarity to the idea being expressed.

In the text provided parallel structure is evident by indicating the action companies need to take toward its employees: they need to encourage and reward employees that make use of alternate means of transportation and telecommuting opportunities.