There's been some discussion on this site in recent months about the need for parks to be more proactive in terms of safety and accident prevention. At least one park has done so in terms of vehicle safety, and another will try to reduce risks on the road for the July 4 weekend.

With the U.S. Senate's inaction on a measure that would direct the National Park Service to allow stocking of non-native fish in North Cascades National Park, that practice has come to an end. But park biologists are working with Washington state fisheries experts to improve fishing elsewhere in the park.

Officials at Lake Mead National Recreation Area are expecting plenty of visitors for the holiday weekend, and they're reminding them about new regulations that went into effect last March: glass and styrofoam containers are no longer welcome in the park.

Shuttle bus systems are growing in popularity as one way to reduce the impacts of private vehicles on parks—and on the experience of visitors. Here's a look at some of those systems at NPS sites around the country.