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Replacing Zion’s propane-powered buses is part of the park’s plan to manage booming visitor numbers while preserving its natural landscape and clean air.

The new public transit route connecting southwest Utah’s largest city and one of America’s most-visited national parks is expected to launch by late July. It could remove cars from congested roads and help tourism workers get to their jobs.

The Utah Transit Authority Board of Trustees has taken the first steps towards approving a 2016 budget. UTA interim president and CEO Jerry Benson…