Speeders are more easy to deal with they are past you and gone. Over cautious drivers are the ones that create problems and are a general headache. You want to just get past them and leave their nonsense behind.
They brake when you don't expect it, take forever to change lanes, don't know how to merge on or off of main freeways properly, and they don't keep up with the flow of traffic.
Over cautious drivers are a danger to others especially in poor weather conditions.
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