According to a report on today's NPS Digest, the Natural Sounds and Night Skies Division has recently published three reference guides to help park staff and visitors reduce their noise footprints.
Two of the guides were published for national park staff, contractors, and concessionaires. A third guide was developed with park visitors in mind. This publication provides educational information and tips so that visitors can reduce noise while visiting national parks (local and state parks as well), and enjoy the unique soundscape that each park has to offer. In addition to ways that individuals can minimize their noise footprint, the guide offers these tips for creating a quieter ride:
• Turn off car alarms and disable sounds on electronic door locks.
• Use alternative transportation such as shuttles.
• Turn off vehicle engines when stopped at wildlife traffic jams, overlooks, or roadside pullouts. Idling vehicles create unnecessary noise.
• Keep car radio volume at a low level to avoid disturbing other visitors.
• Turn off radios and open windows to hear interesting park sounds.
• Drive at posted speed limits (driving faster creates more noise).
• Don’t rev it up! Ride motorcycles respectfully in parks.
Titled "A National Park Guide: Protecting and Enhancing Soundscapes" is available publicly here.