BK's left slow left lane puzzle:
A. When the Eastbound Glendale Freeway (134) merges with the Foothill Freeway (210), which enters from the left, the 134 left hand labes back up.
B. When the Eastbound Riverside Freeway (91) meets the Orange Freeway (57), there is traffic existing right from the 91, which often speeds up those lanes, the the 91 left hand lanes must cope with the traffic entering from the 57 and the congestion just ahead when the 91 meets the 55.
C. When a freeway loses its Diamond lanes, the left lanes slow down to accommodate the resulting merge.
This is why savvy commuters use a helicopter!
der Brucer