Big Springs and St George
Take I-80 west to I-76, that to DEN, then I-70 and I-15 to Los Angeles. If you drive 12 hours per day with few stops, you can make Big Springs, NE (at the jct of I-80 and I-76), on the first day. Stay at Ogallala, Big Springs, Julesburg or Sterling, wherever you want to quit. Next day, drive to St George UT, and 3rd day you can be in LA by mid-afternoon. Tough drive. Make sure you are very well-rested before you start and don't drive drowsy -- if your mind starts to drift, stop -- it's dumb to kill yourself for a time schedule. Bob