Above are some of the most common and most important intersection signs.
Intersection signs include the crossroad (A), side road (B), T-intersection (C), Y-intersection (D), and circular intersection signs.
If you understand which road you are on, it should be pretty simple to distinguish the signs and understand what they mean. Remember, when roads are shown on signs like this you are always traveling on the road that starts at the bottom of the sign.
California Driver Handbook
For some strange reason, the California Driver Handbook insists on calling the side road sign (B) for T-intersection, which may confuse many readers.