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The ramps lead to southbound Highway 1, also known as the Park Presidio, as well as going south through the San Francisco to 19th avenue.
Those off-ramps will be closed for four weekend mornings between 5:30 a.m. and 11:30 a.m.
Caltrans needs to clear trees in preparation for the actual Doyle Drive construction, which is set to begin this fall.
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