IMO "weaving through traffic" is not a skill that makes you a good driver. It might take skill, but it's irresponsible and reckless. A good driver understands that weaving is more likely to result in injury, property damage, or no result (think of the lane-switchers in rush hour traffic that you end up right next to after 30 mins) than an actual benefit. I'm not sure that it should be included in a confidence measure for driving ability.