The wreck occurred when several closely packed cars were jostling for position at top speeds of about 175 mph.

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Saturday's wreck occurred when several closely packed cars were jostling for position at top speeds of about 175 mph.

CNN: February 24, 2013 -- Updated 2355 GMT (0755 HKT)

The track itself is a sequence of closely packed rectangular metal frames, each of which can act as an independent electrical circuit.

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The molecules in such liquids are closely packed but loosely arranged.

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In Acapulco, the blue water of the bay gives way to a skyline dotted with closely packed tall white hotels operated by major hospitality companies such as InterContinental Hotel Group, Starwood Hotels, Wyndham Worldwide Corporation, and Global Hospitality Investments.

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Several closely-packed cars were jostling for position at top speed when they got tangled up, setting off a dangerous chain reaction that ensnared a number of vehicles.

CNN: February 24, 2013 -- Updated 0407 GMT (1207 HKT)