Travelers will encounter some unsettled weather with rain and warm temperatures during the early part of the week, the Capital Weather Gang says. Commuters approaching downtown D.C. will encounter long-term road work on the 14th Street Bridge, Constitution Avenue, Rock Creek Parkway, the New York Avenue Bridge, Pennsylvania Avenue SE and the 11th Street Bridge. Metro riders probably will see more police in the transit system as a security measure following the death of Osama bin Laden.

11th Street Bridge

The District Department of Transportation is creating a new traffic pattern this weekend for vehicles entering the intersection of Martin Luther King Jr. Avenue and Good Hope Road SE from the outbound 11th Street Bridge over the Anacostia River. The goal is to increase the size of the work zone and speed progress on construction of the new bridge and its approaches.

To do that, the ramp from the bridge to Martin Luther King Jr. Avenue will be closed. Traffic heading toward the avenue will be routed onto the Good Hope Road ramp. This detour will remain through 2011. Expect delays, especially during the afternoon rush.

Ride On schedule changes

Ride On, the Montgomery County bus service, says it has adjusted the schedules on nine routes to more accurately reflect the bus running times. These are the routes: 1, 46, 54, 55, 59, 63, 66, 67 and 70. Use this link to find the new schedules.

VRE adds cars

The Post’s Jennifer Buske reports that VRE trains 300, 313, 310, 311, 312, 301, 326 and 329 will get additional cars starting today. Train 302 will lose a few cars so train 306 can become an eight-car train. To accommodate the longer trains at VRE’s storage yard in the District, VRE will have to send a train back to Manassas after its morning run.

In another move to reduce crowding, VRE’s new step-up fare takes effect today. Commuters can board certain Amtrak trains for $5 instead of $10. VRE hopes the cost reduction will shift about 60,000 riders to Amtrak

New York Avenue Bridge

Traffic at the New York Avenue Bridge over the railroad tracks north of Union Station wasn’t so bad last week, despite the narrowing of the lanes from six to four. But that construction zone could start to live up to its true potential this week, with heavier traffic.

See some alternative routes in this pdf map. Or sign up for the Bridge Bucks program to share rides or take transit.

Constitution Avenue

Expect to find up to two westbound lanes and two eastbound lanes closed on Constitution Avenue between 23rd and 20th streets for the National Park Service’s reconstruction of the avenue. The location of the lane closings within this zone may change daily. Crews are working on the utilities during the early stages of the project.

Rock Creek Parkway

Traffic restrictions continue on the Rock Creek Parkway in Woodley Park. Here’s what the National Park Service says to expect on weekdays.

Cathedral Avenue (south of Woodley Road): Southbound closed all the time. Northbound open all the time.

Beach Drive: Both lanes open all the time.

Rock Creek Parkway: A lane is closed all the time on the southbound parkway where workers are installing concrete curbing and gutters. Starting today, a lane will be closed all the time on the northbound parkway for similar installations. This will cause more delays during the evening rush

Shoreham Drive: From 7 to 9:15 a.m., only one lane will be open southbound. The northbound side is closed. From 9:15 a.m. to 7 a.m. the next morning, only one lane will be open northbound and the southbound side is closed.

Overnight closing in Tysons

The eastbound lanes of Tysons Boulevard will be closed from Galleria Drive to Route 123 (Chain Bridge Road) from 11 p.m. to 5 a.m. Monday through Wednesday nights for pier and station work on the Dulles Metrorail project.

The turn lanes from Galleria Drive to eastbound Tysons Boulevard also will be closed. Through traffic on eastbound Tysons Boulevard toward Route 123 will be detoured to make a left on Galleria Drive/Westpark Drive, a left on Westbranch Drive, a right on Tysons Boulevard, then a left on International Drive to reach Route 123.

Route 7/Spring Hill Road

The Dulles Metrorail project also is continuing overnight work to install a big waterline at the intersection of Leesburg Pike (Route 7) and Spring Hill Road. This requires closing all lanes of northbound Spring Hill Road for a 150-foot stretch north of Route 7 from 9:30 p.m. to 5 a.m. Project managers expect the work to continue overnights through the middle of May.

George Washington Parkway

Overnight Wednesday, the exit ramp from Memorial Bridge to the southbound George Washington Parkway and the exit ramp from Route 27 to the parkway will be closed. The closings, to install new median guardrails between the northbound and southbound lanes on the parkway, is set to begin at 7 p.m. Wednesday and end by 5:30 a.m. If the weather is bad, it will be rescheduled for May 10-11.

On May 10, 11 and 12, the National Park Service plans to close the exit ramp to southbound I-395 between 10 a.m. and 3 p.m. to complete storm drainage work on the southwest side of the Humpback Bridge. The bridge project is scheduled to be done by late spring.

Weekend Beltway lane closings

The Woodrow Wilson Bridge project plans to close the Capital Beltway’s outer loop THRU lanes next weekend. The closing is scheduled to begin Friday evening and continue through mid-morning next Sunday. During that time, workers will place a large storm drain across the THRU lanes.

The closing will extend from just before Telegraph Road to the Route 1 interchange in Virginia. The two LOCAL lanes on the outer loop will remain open, and outer loop access to the Telegraph Road exits will remain open.

The LOCAL lanes are called such because they provide access to local exits, but they continue through to the Wilson Bridge and Maryland. Use them while the THRU lanes are closed or consider taking the 14th Street or American Legion bridges across the Potomac River during the closing.

Weekend Dulles Metrorail work

The Dulles Metrorail project will continue working this weekend on the area that will become the junction between the new line and the Orange Line.

For transit riders, that means trains will share a single track on the Orange Line to get around the work zone. For drivers on Interstate 66, watch for a closing of the left through lane eastbound from 300 feet west of the Dulles Connector Road (Route 267) overpass to 500 feet east of the Great Falls Street overpass.

This lane will be closed from 9:30 p.m. to 5 a.m. Friday night and from 10 p.m. to 5:30 a.m. Saturday night.