Idling for more than 5 minutes at a time is a waste of fuel. Not only does it burn fuel, but it has also been linked to lung cancer, asthma, cardiac diseases, and other serious health risks in truck drivers. If idled and left unattended, there are chances of theft in the truck. States do have laws that prohibit truck idling. For example, nine states — Texas, Massachusetts, Connecticut, Delaware, Colorado, Maryland, New Hampshire, New Jersey, Vermont, and Washington, D.C., have limited idling between three to five minutes most vehicles. Another 14 states limit idling for certain vehicles like school buses, state-owned vehicles, or vehicles over 10,001 pounds.  18 states offer grants, loans, tax credits, or pilot programs to provide incentives for adopting idle reduction technologies.