Somebody from LA can probably correct me if I'm wrong, but if I remember right the reason why LAFD has stuck with wooden ladders is because the city generally has all overhead power lines. Since they constantly have earthquakes, there are fewer underground power lines than in a typical large city. The thought being that underground lines are more likely to break when the ground moves. So with lots of overhead lines, they need ladders that won't conduct electricity. It's the same reason San Francisco continues to use wooden ladders.
At least that's what I remember reading somewhere!
At least that's what I remember reading somewhere!