[sliverstorm]

Operating the controls of your vehicle to respond to environmental conditions increases your safety more than it decreases it. Turning on my high beams does take a few brain cycles to flip the switch, but it also lets me spot the deer on the side of the road.

[mikeash]

It's almost as if there are legitimate reasons not to have 100% of your attention focused on the road, that aren't simply attempts to rationalize unsafe behavior.