OAKLAND (CBS SF) – Caltrans will close the westbound Interstate Highway 580 connector leading to the San Francisco/Oakland Bay Bridge Saturday night for emergency replacement of an “attenuator” smart safety crash cushion there in the MacArthur Maze, starting at 10 p.m., with a planned reopening by 7 a.m. Sunday.

These “attenuator” devices, anchored to the roadside guard rails, are designed to stop out-of-control vehicles with the force and resistance needed – with smaller or slower vehicles, less resistance is provided than for larger vehicles or vehicles moving faster.

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As part of this cushion replacement work, the connectors from westbound State Highway 24 to both the eastbound and westbound I-580 will be closed, as will the ramp from eastbound Interstate Highway 80 to West MacArthur Boulevard. Motorists will be able to access eastbound 24 from westbound I-580.

Here are some options to reach the Bay Bridge or other desired routes, depending on what roadway you’re on:

(1) From westbound I-580, take the eastbound Interstate Highway 80 ramp (Emeryville area leading to Berkeley) and exit at Powell Street; left turn onto Powell Street; sharp right onto West Frontage Road; turn right to enter the WB I-80 on ramp to continue on to the Bay Bridge.

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(2) From westbound West MacArthur Boulevard, continue to Hollis Street and turn right onto Hollis; make a left turn onto 40th Street, which will become Shellmound Street in Emeryville. Turn left onto Shellmound Way, then left onto Christie Avenue, then right onto Powell Street to enter eastbound I-80.

(3) From westbound 24, continue to southbound Interstate Highway 980 and exit at 27th Street/West Grand Avenue exit. Enter Northgate Avenue, turn right on West Grand Avenue; proceed on Grand Avenue to enter the eastbound I-80 onramp to reach westbound I-580.

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