Next weekend's controlled demolition of the old Tappan Zee Bridge may cause some backups.
At 9 a.m. Saturday, state police will close entrance ramps to the northbound - westbound Thruway at exit 9 in Tarrytown; Route 1-19 in Elmsford, and exit 22 on the Saw Mill River Parkway.
State police will also close entrance ramps to the southbound - eastbound entrance ramps at exits 10 and 11 in Nyack.
After the closures, workers will use explosive charges to demolish the old bridge.
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