That's the same scene? Did you try shonner's suggestions? That car scene looks washed out. The fog probably complicates things tho. The sun looks too big also and with fog probably wouldn't be big and bright like that. Try turning off GI and seeing what lights are doing...I don't know what you have, but it is too much. You might also want to play with gamma adjustment at render just to see if there is any help there. If you have sunlight w/ a bunch of other lights it can quickly be too much.

No need to think outside the box....
    Just make it invisible.