Traffic might be the perfect reason to use a robot truck. I'm pretty sure that, if they do decide to use robot trucks, they'll have some kind of traffic awareness system built in that can make reflex moves a million times quicker than you and I could.
Traffic could go either way when robots are widespread on the road. Some say as you say; that the robot cars and trucks will take in all available information and optimize their moves and routes relative to traffic. The available information will include the robots talking to each other about their trip plans and cooperating to optimize traffic flow.
Others say traffic will get worse because congestion will increase. When a human driver does not have to sit in traffic or go to the trouble of driving, it may be more likely that the number of trips will increase. Why drive on an errand to the store when you can simply send the robot to go get whatever it is what you want? Why worry about traffic and congestion when you can sit in your car and work on other stuff while the robot works its way through the congestion?
With vehicle interiors redesigned to serve as mini offices or entertainment centers, time in a car or truck during rush hour may come to be viewed as time well spent instead of time wasted. With people more willing to be on the road during rush hour, congestion may increase.
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