It's their job to merge safely. It's your job to aide that process. Defensive driving allows you to be in control, and you can more readily control how far ahead of you they are, than how close to your rear end they choose to be.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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