Back Up Lights problems of the 2010 Toyota Prius

Both low beam headlights do not go on at all. Were working properly on way to a destination at 9pm, then did not go on after car was parked after 2 hours. This has never occurred before. Bulbs are not burned out, fuse is not blown. All other mechanisms on fuse working properly (backup lights, horn). Parking lights and hi-beams work. Very dangerous drive home, use of hi-beams on surface streets not safe for other drivers.

I have had repeated issues with the low beam headlights since purchasing my 2010 Toyota Prius. The low beam headlight bulbs burn out and have to be replaced every 2-6 months. Replacement bulbs have included bulbs purchased from Toyota and auto parts stores varying in price level and lumens. I have had two instances where both headlights simultaneously malfunctioned would not illuminate. The first was when I had my car turned off for several hours and when I started the car the lights would not illuminate. I turned the car off and checked the headlight bulb connections. I had to drive home approximately 5 miles using the high beams. I took my car to oxmoor Toyota, the dealership where I purchased the car new, and the service department determined that my car was functioning normally. They replaced both low beam headlight bulbs with Toyota bulbs. The second time that both low beam headlights failed the car was parked but running with the low beam headlights illuminated. The headlights were switched off but the car remained running. When I switched the lights on, the low beam headlights would not illuminate. I turned car off and checked the low beam headlight bulb connections. The high beam lights, turn signals, backup lights, and brake lights functioned normally. I drove home approximately 20 miles with the high beams. Once home, I verified that the fuse was not burned out. Two months later the front driver's side low beam headlight would not illuminate. I decided it was time to return to the dealership where I brought my car to see if Toyota had found a solution to this issue. The service manager said that they only issue was the burned out low beam headlight bulb.