Nobody likes paying tolls. It's difficult to explain the concept of dynamic tolling, where the price varies to maintain the flow of traffic. And it's difficult to explain why highway widenings don't wind up helping commuters in the long run.

When I look at the faces of turning drivers, I mostly see them looking in the direction of oncoming motorists rather than at the people they're about to turn into.

I don't know of any source for online maps showing the platform, stairs, escalators, elevators, mezzanines and other station details.

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

I think that maps showing platform details would be useful to visitors, especially to chaperones of school groups, etc. Also useful would be either a compass rose or an arrow pointing North at every metro exit. Emerging from underground is disorienting, especially at night.

As our eyes age, they have a tougher and tougher time adjusting to rapid changes in lighting, and we need to be aware of this.

Many police officers watch for vehicles without headlights because it's a telltale of a drunk driver.