What is the legal status of idling gas-powered vehicles in Maryland if left unattended?

In Maryland, leaving a gas-powered vehicle idling while unattended is illegal due to laws aimed at reducing air pollution and promoting public safety. Specifically, the law emphasizes that vehicles should not be left running unattended because of the potential risks it poses, such as theft or an accident occurring if the vehicle rolls away. Although there may be contexts in which brief idling is tolerated, the legal framework prioritizes safety and environmental concerns, which is why it is classified as illegal to leave an idling vehicle unattended.

The other choices either imply a necessity or allowance for idling that contradicts the established legal requirements, as idling is not encouraged or deemed necessary under any circumstance.