Grand Canyon National Park is getting $27.5 million in federal highway money to upgrade its aging fleet of shuttle buses, which help the more than 4 million people who visit each year get around the huge park.

The replacement project includes 30 new buses — 20 that run on compressed natural gas and 10 electric buses. Charging stations will be installed for the electric buses. The new buses are expected to reduce pollution and ease the overcrowding of vehicles at the park.

The park has over 270 miles of paved and unpaved roads.

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Guests exit a shuttle bus at Grand Canyon

Guests exit a shuttle bus at Grand Canyon National Park in Grand Canyon, Arizona, on June 24, 2015. At least 27.5 million in federal funds is being given to Grand Canyon National Park to upgrade its aging fleet off buses. ( Daniel Acker/Bloomberg via Getty Images)

Officials from the Department of Transportation, Interior Department, the park and surrounding communities are announcing the grant Thursday at the canyon’s south rim to talk about the grant from the Federal Highway Administration.

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"With this National Park Service grant that is part of President Biden’s Investing in America agenda, we’re helping to deliver safe, sustainable and reliable transportation investments that help families and visitors explore the Grand Canyon National Park and surrounding communities," Federal Highway Administrator Shailen Bhatt said in a statement.