From Caltrans:
SR 74 [iN THE SOUTHERN CALIFORNIA AREA]
IS CLOSED FROM 4.2 MI WEST OF THE ORANGE/RIVERSIDE CO LINE TO THE
ORANGE/RIVERSIDE CO LINE FROM 2030 HRS EACH NIGHT TO 0430 HRS EACH MORNING
7 DAYS A WEEK THRU 12/30/09 - DUE TO CONSTRUCTION - A DETOUR IS AVAILABLE
1-WAY CONTROLLED TRAFFIC AT VARIOUS LOCATIONS FROM 4.2 MI WEST OF THE
ORANGE/RIVERSIDE CO LINE TO THE ORANGE/RIVERSIDE CO LINE FROM 0430 HRS TO
2030 HRS 7 DAYS A WEEK THRU 12/30/09 - DUE TO CONSTRUCTION
1-WAY CONTROLLED TRAFFIC AT VARIOUS LOCATIONS FROM 2.1 MI EAST TO 3.3 MI
EAST OF THE JCT OF I 15 (RIVERSIDE CO) FROM 0900 HRS TO 1500 HRS 7 DAYS A WEEK
THRU 4/30/08 - DUE TO PERMIT WORK
Other than that, I haven't been there in three years.
By the way, you need to make your sig picture 3 x's bigger. I don't think anyone can see it.