Ideas frequently submitted to Ford, so quit it, they don't want anymore :

• Dual fuel filler doors (one on each side of the vehicle), or in a specific location on all models (such as the rear of the vehicle)
• Built in car jack assemblies for easier changing of tires, or working beneath the vehicle
• Infrastructure ideas requiring electrified roadways (will need government sponsored effort)
• Cars that do not use gasoline/diesel. Cars that use air/water to extend range (HHO, Brown's Gas, electrolysis, windmills, turbines, magnets on wheels/driveshaft, and solar)
• Exterior indicator lights to notify others that occupants are not wearing their seatbelts
• Disable cell phones and texting while driving
• Transition windshields / window screens for sun and/or element barrier
• Brake light changes to alert other drivers (intensity, flashing, location, color); these are regulated by law
• Occupant detection systems – children / pets left alone in the vehicle

http://corporate.ford.com/content/dam/corporate/en/innovation/Innovation_Frequently_Submitted.pdf