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In heavy traffic i knock the gap down to 1 second to avoid people cutting in, way too short for human reactions but this is the gap most seem to drive at in congested traffic. Given the number of measurements a second being taken and the car reacting quicker than me even noticing a change in speed by the car ahead I’m happy to trust the robot overlords with this. It also allows me to focus my sight further up the road for what might develop rather than the bumper of the car in front.
Do you have problems with people pulling into the space in front of you?