Question

how can Ocean surface current at places where the cold and warm currents meet create problems for transportation?​

Answer 1

here is your answer:

Areas where warm and cold currents meet tend to have regular foggy conditions, as the overlying warm and cold air come in contact with each other. they also tend to have high biological productivity, because plankton growth is encourage by the mixing of war mands. cold current

Answer 2

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Some of the world's most productive fishing grounds are located where warm and cold currents converge. For example, where Labrador current (cold) and Gulf stream (warm) meet, a dense fog is there and it is one of the richest fishing grounds of the world. they become warm.