A column in the newspaper by an engineer working on self-driving cars says they are in the works, and have successfully driven between cities in California, and even down Lombard Street in San Francisco. Besides being safe, there are a few other benefits. Cars traveling long distance on a highway should be able to hook together like a train, reducing fuel consumption. And eventually, it should enable car sharing on an as-needed basis. Imagine signaling for a car, having it drive itself to you immediately, pick you up, and take you where you need to go, then go pick someone else up, before coming back to get you when you’re ready.