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Only 3 years commuting in CA for me, but same principle. I never had anyone intentionally try to door me or hit me. Here, in addition to more aggressive drivers and the possibility of a ticket, it's that the lanes are narrower and twistier and you have pedestrians and bicyclists throwing themselves into traffic with suicidal abandon. In most of LA the roads are straight and lanes are about a car and a half wide, turn lanes are well marked, intersections are predictable and at right angles, etc. Much easier to split.