Which statement is true about a Quiet Zone?

A Quiet Zone is a designated area where the normal sounding of train horns at public highway-rail grade crossings is restricted. The key feature of a Quiet Zone is that it may contain multiple public highway-rail crossings. This means that within a particular stretch of track, several crossings could exist where trains are not required to sound their horns under typical conditions, provided that additional safety measures are implemented, such as gates, lights, or other traffic control devices to ensure safety at these crossings.

In the context of the other options, it’s important to recognize that a Quiet Zone does not need to be in a rural area, as these zones can also be established in urban settings. The statement regarding the complete abolition of all train signals is misleading because while horn use is restricted, train signals themselves (like lights and gates) are still necessary for safety. Lastly, the notion that locomotive horns may only be used during emergencies reflects a subset of the overall regulations but does not encapsulate the essence of what constitutes a Quiet Zone, where the general expectation is to reduce horn noise while still maintaining safety mechanisms for crossings.