slow lane
US /ˈsloʊ leɪn/
UK /ˈsloʊ leɪn/

1.
the lane of a multi-lane road or highway intended for slower-moving vehicles
:
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Please keep to the slow lane if you are driving below the speed limit.
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The truck moved slowly in the slow lane.
2.
a situation or lifestyle characterized by a slower pace, less stress, or less ambition
:
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After years in the corporate world, he decided to move to the slow lane and open a small bookstore.
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Some people prefer the slow lane, valuing peace over ambition.