Slowly but surely, natural gas vehicles are gaining momentum. State governments have shown they are particularly interested in integrating their fleets with natural gas powered cars and trucks. That's a great sign for companies like General Motors (NYSE: GM) and Ford (NYSE: F), both of which are growing their NGV offerings in 2014. In this video, Fool.com contributor Aimee Duffy talks to Tyler Crowe about which states offer the most compelling environments for NGVs right now, and what investors need to think about as this trend continues.

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Fool contributor Aimee Duffy owns shares of Ford. Fool contributor Tyler Crowe has no position in any stocks mentioned. The Motley Fool recommends Ford, General Motors, and ONEOK. The Motley Fool owns shares of Ford. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.