I don't believe any sort of traveler does a better job than any other sort of traveler at obeying traffic safety laws. It's difficult to foresee a camera program that can be used with bikers and walkers.

I don't see any possible excuse for any driver anywhere to endanger people.

Many Saturday mornings, I take 495 from Fairfax to Maryland in the morning, and I'm astonished by the speed of many of the drivers. Even when I drive 70 mph, I'm being passed by people driving 80-90+ at times.

Drivers tend to look for other drivers, rather than for pedestrians or cyclists.

Back in 2011, when the weekend maintenance disruptions got more aggressive, we were told that the work on weekends and at night and midday would be enough to get the system back to a state of good repair.

If you think your job requires you to endanger people, get another job.

The cars themselves are getting smarter and will be increasingly able to assist drivers - to the point where the cars will be completely automated.