When you get down the 5 south of Magic Mountain/Valencia, look for the 210 to Sylmar/Pasadena. That will take you through Pasadena/Monrovia/Asuza/San Dimas and Ontario, connect you via a relatively new connector to the 15 South to the 10 East. You will pop onto the 10 off the 15 at San Bernardino. Keep going east and you're homefree! You will thus avoid the ugliness of the 10 through Pomona and Claremont. Basically from the 5 you will go east well north of the 10 and West LA and Downtown. It is much quicker and easier. It is unreal nasty traffic on the 10 through those parts.

__________________