I always do. Way too many people seem more focused on chatting on their cell phone, texting or what the latest social media post has to say instead of paying attention to their driving. I assume those other people I don't know are probably going to do something unexpected. Some people never use turn signals and even if they do, there is no guarantee they are actually planning to turn. When driving on rural roads that have a 55 mph speed limit, I always am watching for those who have NO grasp of the closing speed of other traffic and tend pull out in front of people with not nearly enough spacing. No idea if people are just too self-absorbed or clueless, but always have to be aware of the traffic around you.