At least on the South Bay, I think that drivers are more impatient because the cities have failed to do anything real to improve traffic. They focus on highly v

At least on the South Bay, I think that drivers are more impatient because the cities have failed to do anything real to improve traffic. They focus on highly visible things, like a new overpass or adding a lane to an onramp, or something of this nature. Then they'll spend something like $1 billion on a new library or town hall or $100 million on a rec center or whatever. Meanwhile, the actual road infrastructure cannot support the incredible increase on net new job creation. This makes for traffic jams, everywhere, so people become impatient and increases the number of irrational decisions they make. I live in the hills, several miles down a very narrow, curvy country road. Nobody goes less than 10 mph above the speed limit, which is genuinely unsafe on this road. They do it because traffic is much lighter than the rest of their commute, and they just want to get home. Of course, they're only shaving somewhere around 28 seconds of travel time off of their total commute while increasing the probability of a deadly encounter with a hapless bicyclist who ignorantly thinks they are riding on a quiet, back-country road. I am quite certain that the cost of adding a separate bicycle/pedestrian path is quite high, as it would require bulldozing parts of moderate sized hills, and compared with the fanfare of a new police station or city hall, a new bicycle lane for some back road just doesn't compare. However, knowing the residents of this back road and the town in general, I'm quite certain such a path would generate a lot of real use and potentially save lives. But I'm quite certain this kind of project will not hapen in my lifetime.