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Personally, Volume is the biggest problem (what Frank said). The roads simply can't handle the volume. Call it what you will (not enough lanes, poorly timed lights, etc.), its all driven by too many people with not enough road.
The other big one (but not that big) is speed limits too low. I spend about 30% of my commute on roads with a speed limit of 35mph. I usually go 40mph if nobody is in front of me (impossible), but sometimes I get stuck behind someone going exactly the speed limit. This means on every little hill my car will downshift to 3rd. When this happens once or twice a minute, it is beginning to have a significant impact on economy I'd assume.
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