(Linda Davidson/The Washington Post)

The road work highlight is the opening of a new entrance to the 11th Street Bridge over the Anacostia River, but the more significant event at the bridge is scheduled for this coming week, when the new local span opens.

This weekend, people will be traveling to Andrews Air Force Base for the annual air show. The Nationals play the Orioles at Nationals Park, and D.C. United plays at 7:30 p.m. Saturday in RFK Stadium against Toronto FC. If you’re in the mood for food, check out the Taste of Arlington on Sunday.

The Capital Weather Gang likes the look of Friday and Saturday, but is worried about showers developing Sunday.

With Memorial Day weekend coming up, check out our annual summer getaway guide in Sunday’s Post Metro section. Then join me at noon Monday for our weekly online chat, when we can look forward to those vacation routes and look back at any bad travel experiences you had over the weekend.

11th Street Bridge

The District Department of Transportation this weekend is opening a new ramp at the intersection of M and 11th streets SE that leads onto the 11th Street Bridge and southbound Interstate 295.

Drivers who want to reach Anacostia will continue to use their current route along 11th Street SE, up onto the bridge and over the river to Martin Luther King Jr. Avenue and Good Hope Road SE.

A bigger deal at the District’s largest road construction project is scheduled to occur on Wednesday, with the opening of the new local span. That’s the third and final span in the bridge replacement project.

The opening of the local span will create new routes to and from Anacostia. Some of this will be temporary, but the 13th Street ramp on the Anacostia side of the river will close permanently. (More details about these route changes to come in a separate posting.)

Metro weekend delays

Repair work on three Metrorail lines is scheduled for 10 p.m. Friday through the rail system’s midnight closing Sunday.

Orange Line: Free shuttle buses will replace trains between East Falls Church and West Falls Church during work on the Silver Line connection.

Trains will operate between Vienna and West Falls Church every 20 minutes, Metro said. Between East Falls Church and New Carrollton, they will operate on their regular weekend schedules. Add about 20 minutes for extra travel time using the bus bridge.

Red Line: Trains will share a track between Takoma and Forest Glen, and between Van Ness and Friendship Heights. They will leave the ends of the lines at Shady Grove and Glenmont about every 24 minutes. Add about 20 minutes because of the single-tracking.

Between 9 a.m. and 9 p.m. Saturday and Sunday, more trains will be operating in the interior part of the line, between Van Ness and New York Avenue. In that zone, trains should arrive at platforms about every 12 minutes.

Green Line: Trains will share a track between Greenbelt and Prince George’s Plaza. Trains are scheduled to operate every 16 minutes. Add 10 to 15 minutes to normal travel times because of the single-tracking.

Yellow Line: There’s no work scheduled on the Yellow Line, but because of the single-tracking on the Green Line, Yellow Line trains will operate only between Huntington and Mount Vernon Square. (On weekends, they normally would continue north to Fort Totten.) Riders who want to continue north will have to transfer to Green Line trains.

Andrews air show

The annual air show is open to the public from 8 a.m. to 5 p.m. Saturday and Sunday. You can’t park on the air base, but you can park at FedEx Field off the Capital Beltway in Landover and take a shuttle bus to the show. The buses heading to the show will stop running at 1 p.m. each day, but the return service will continue.

Shuttles also will operate from the Metro Green Line’s Branch Avenue station. They also will stop running to the show at 1 p.m. Saturday and Sunday, but will continue return trips. (Double check the Metro maintenance schedule above for Metrorail weekend delays.)

People with disabilities should be able to find accessible buses at both FedEx and Branch Avenue.

See the full schedule of events on the show’s Web site.

Nationals Park

The three weekend games with the Orioles at Nationals Park probably will draw a lot of fans from the north. If they plan to park at the big lot by the Greenbelt Metro station just off the Capital Beltway, they should allow extra time because of the single-tracking this weekend between Greenbelt and Prince George’s Plaza.

They won’t be any better off heading to the northern stations on the east side of the Red Line, because there will be single tracking in that area as well.

The single-tracking involved in the weekend maintenance program can be especially confusing for those attending games or other events on Friday nights. Riders get to the starts of the events as usual, but afterward, they encounter delays using the same Metrorail routes.

The Trip Planner on Metro’s Web site and the electronic message boards on the station platforms are of limited value on weekends because they do not accurately reflect all of the delays.

Canal Road NW

From 9 p.m. Friday through 5 p.m. Saturday, drivers may encounter single-lane traffic and traffic stops along Canal Road between Arizona Avenue and Chain Bridge Road as crews resurface the roadway.

Ohio Drive

Southbound Ohio Drive is closed on the Washington Boundary Channel side of Hains Point under the 14th Street and CSX train bridges through 5 a.m. Saturday. Workers are digging a trench for a new electric duct to East Potomac Park.

Constitution Avenue

From 7 p.m. Friday to noon Saturday, crews will be working on a utility trench on Constitution Avenue NW at 16th Street. Three lanes in each direction on Constitution Avenue may be closed between 176th and 15th streets. A minimum of one lane will get by in each direction.

Taste of Arlington

The Taste of Arlington festival will be held on Wilson Boulevard from noon to 5 p.m. Sunday on front of the Ballston Common Mall. Ballston, on the Orange Line, is the nearest Metro station, but be sure to double check the Metro schedule above. There also will be a bike valet at the site.

Arlington County Police Department will be closing these roads between 2 a.m. and 10 p.m. Sunday:

* Wilson Boulevard eastbound at Glebe Road.

* Wilson Boulevard westbound at North Randolph Street. (Randolph Street will remain open).

* North Stuart Street between North Ninth Street and Wilson Boulevard. (Buses will be allowed on North Stuart Street between Fairfax Drive and North Ninth Street.)

* North Ninth Street between North Stafford Street and North Stuart Street. (North Ninth Street will be open to Metrobuses only.)

Traffic southbound on North Taylor Street from Fairfax Drive will be directed to go westbound at Wilson Boulevard.

Ride On schedule changes

Montgomery County’s Ride On bus system will make weekday time changes on seven routes this coming week. They are routes are 48, 49, 57, 58, 61, 64, and 74. The schedule adjustments are intended to more accurately reflect the real travel times on these buses, the county said.

For details on the schedule changes, use this link to the Ride On Web page and look for the routes marked “NEW.”

Virginia 511

The Virginia Department of Transportation is working on changes to its 511 travel information system this weekend.

The service will be unavailable between midnight Sunday and 6 a.m. Monday. If you are signed up for the personal service My 511 Control Room, your user name and password will be disabled during this time. When you go to use the control room for the first time after the weekend upgrade, you will have to create a new free account, giving your e-mail address and preferences.