Heck, LA as you describe it sounds like here.
(I've actually visited LA three times and have experienced driving in the horrendous traffic on each occasion. The difference between there and here is your traffic jams are six or eight lanes wide and ours are just three or four.)
heres a snapshot of the Sepulveda Pass (the route i had to take) on a normal day with no accidents.
Now imagine this roadway with 3 accident scenes spaced 2 miles apart.
Scary, huh?