Green Vehicle Laws and Regulations in Connecticut

Connecticut drivers of fully electric-power cars, hybrids, and a variety of other fuel-efficient vehicles can find green driver laws and regulations in the content below. At this time, CT doesn't have many green-vehicle laws, but the focus on the environment is ever-evolving. Keep pace by referring back to this page in addition to periodically consulting your local Department of Motor Vehicles branch and the Alternative Fuels Data Center.

Of course, all drivers on Connecticut's public roadways must abide by CT's general traffic laws. If it's info specific to eco-friendly drivers that you're looking for, also consult our Connecticut Green Driver Incentives page. Here you will find more on how to save money and time while trying to reduce your carbon footprint.

Connecticut Green Vehicle Registration and Emissions

The CT Department of Motor Vehicles (DMV) requires valid vehicle registration for all vehicles (electric, hybrid, and otherwise) operating on Connecticut roadways. However, the State exempts certain green vehicles such as fully electric cars (non-hybrid) from the emissions test requirement for CT vehicle registration and registration renewal. Consult our Green Driver Incentives page and Connecticut Smog and Emissions Testing page for more.

CT Aftermarket Alternative Fuel Vehicle Conversions

If you have converted your vehicle to run on more efficient energy, it must meet certain requirements for the State to recognize it as an aftermarket alternative fuel vehicle (AFV) conversion.

What Qualifies as an Aftermarket AFV Conversion?

The State classifies conventional original equipment manufacturer vehicles converted to operate on the following as alternative fuel vehicle (AFV) conversions:

• Propane.
• Natural gas.
• Methane.
• Ethanol.
• Electricity.

Requirements for Aftermarket AFV Conversions

If your vehicle falls under the definition above, it must be properly certified for the specific vehicle or engine family under conversion, and meet aftermarket conversion standards as defined by either entity:

• U.S. Environmental Protection Agency (EPA).
• California Air Resources Board.

For more, refer to the Connecticut General Statutes 22a-174g.

Connecticut Insurance Requirements for Eco-Friendly Vehicles

Connecticut residents must insure their vehicles—environmentally friendly and otherwise—in line with the CT minimum insurance requirements. Fortunately, many car insurance providers offer insurance discounts to customers with eco-friendly driving habits and green vehicles. Check our page on driver incentives designed to encourage CT drivers to do their part in protecting the planet.

Idling Restrictions for School Bus Drivers

Not only is idling wasteful—burning up to a half gallon of fuel per hour—it is illegal in Connecticut for school bus operators. As a driver, you may not idle a school bus engine for more than three consecutive minutes when not in motion. Exceptions include when:

• Traffic or mechanical difficulties are out your can't control, forcing you to keep the bus motionless.
• It's below 20 degrees Fahrenheit outside.
• You must maintain a safe temperature inside the bus for special needs students.
• Dropping off or loading passengers on a public road or highway.

For a full list of exceptions, and for specifics regarding this Connecticut idle reduction law, refer to Connecticut General Statutes (Section 14-277).