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Question:

On steep mountain grades, __________ are built to stop runaway vehicles safely without injuring drivers or passengers.

A
Explaination

Escape ramps are located on many steep mountain grades. Escape ramps are built to stop runaway vehicles safely without injuring drivers or passengers. Escape ramps use a long bed of loose, soft material (such as gravel) to slow a runaway vehicle, sometimes in combination with an upgrade.