[Morecambe Ex Pat]

I was taught observation and anticipation, anticipate what other drivers are likely to do and expect the unexpected, that is not passive driving that is defensive driving. If someone is sat in a car, checking the traffic in both directions, it is likely they want to pull out. If I am in a position to let them out I will.
The alternative is to hare up to them, rely on ABS to stop inches from their bumper and then pretend that you are in full control of the vehicle.