BOSTON (AP) — Commuters are bracing for more disruptions as work begins to replace the Commonwealth Avenue Bridge that spans the Massachusetts Turnpike in Boston.

All modes of transportation will be affected, starting Wednesday night when shuttle buses replace trolleys on a section of the Green Line's B branch.

The bridge itself will be closed later in the week to most vehicle traffic. And starting Friday night and continuing through Aug. 7, the turnpike will be limited to just two lanes in each direction at peak travel periods.

State Secretary of Transportation Stephanie Pollack is urging people to avoid the area if possible.

She says the project to replace the structurally deficient bridge will result in "short-term pain," but eventually "long-term gain."