Wednesday is likely to be the wet day this week, but the Capital Weather Gang says commuters in the D.C. region shouldn’t have any trouble on the other days — at least, not from Mother Nature. But the major transportation projects, slowed somewhat by all the rainy days, are out to get as much done as possible before winter sets in.

The region’s biggest highway project, construction of the high-occupancy toll lanes in Virginia, continues to provide challenges for drivers on the western side of the Capital Beltway, particularly around the interchanges with the Dulles Toll Road and Interstate 66. Motorists on Interstate 95 north of D.C. are driving on fresh pavement through the Intercounty Connector work zone, and are wondering if the connector is about the open. The schedule still calls for an opening late this year or early next.

Here are some of the other traffic and transit issues travelers are likely to encounter this week.

Beltway in Maryland

Just west of where the Capital Beltway’s lanes shift for a bridge rehabilitation project in Silver Spring, the Maryland State Highway Administration this fall is resurfacing the Beltway between Colesville and Seminary roads.

Watch for single-lane closings on weekdays between 9 a.m. and 3 p.m. From 8 p.m. to 5 a.m. Sunday through Thursday nights, two or three lanes may be closed.

Meanwhile, the rehabilitation project at the Northwest Branch bridge over the Beltway will close one or two lanes between University Boulevard and New Hampshire Avenue from 8 p.m. to 5 a.m. Sunday through Thursday. Monday through Friday nights, as many as three lanes may be closed between midnight and 5 a.m.

Fairfax Parkway ramp opening

The Virginia Department of Transportation has been making progress on the Fairfax County Parkway extension in the Fort Belvoir area, but a ramp opening scheduled for last week was delayed by rain till today. Drivers heading to northbound Rolling Road from the parkway’s eastbound lanes will use this new ramp.

Last week, the parkway’s southbound lanes between Rolling Road and Donegal Lane shifted to temporary lanes. Workers will be reconstructing the regular southbound lanes.

A Rolling Road overpass is scheduled to be done in May. The project, begun in fall 2008, involved building the final two miles of the four-lane parkway, but also includes connections designed to accommodate extra traffic to Fort Belvoir generated by the federal base realignment program.

I-270 median

Drivers on Interstate 270 between the Capital Beltway and Old Georgetown Road may find single lanes closed between 9 a.m. and 3:30 p.m. weekdays and two lanes closed from 8 p.m. to 5 a.m. Sunday through Thursday. The Maryland State Highway Administration will demolish the concrete barrier wall, then rebuild it. Next spring, watch for milling and repaving in this area.

Commuter lot crackdown

Virginia State Police say they are beginning a campaign to enforce the parking rules at the Horner Road commuter lot by Interstate 95 in Woodbridge. They say drivers have been parking outside the designated parking areas and creating traffic hazards. Sometimes they park in the the travel lanes at the 2,000-space lot and interfere with traffic.

Last week, police set up message boards in the lot to alert drivers about the campaign. This week, police say, vehicles illegally parked will be ticketed and, if necessary, towed.

George Washington Parkway repairs

Drivers on the northbound George Washington Parkway may encounter delays at off-peak hours this week between Spout Run Parkway and the First Overlook, where the National Park Service and Federal Highway Administration are repairing landslide damage. The right lane may be closed between 10 a.m. and 2:30 p.m. weekdays.

Constitution Avenue NW

As the National Park Service continues to rebuild Constitution Avenue NW, drivers may find the four center lanes closed between 21st and 19th streets from 5:30 a.m. to 7 p.m. weekdays. Between 17th and 15th streets, drivers may find two lanes in either direction closed for work on traffic signals, sidewalks and curbs.

Rock Creek Parkway

The park service and Federal Highway Administration are rehabilitating the parkway corridor between P Street and Beach Drive.

All lanes will be open on Shoreham Drive and Beach Drive, but watch for flaggers controlling traffic flow on Cathedral Avenue south of Woodley Road. Workers will be paving between Shoreham Drive and the Connecticut Avenue bridge.

On northbound Rock Creek Parkway, there may be temporary lane closings during off-peak periods. On the southbound side, the curb lane at the Waterside Drive ramp is closed for construction of a new retaining wall.

Metro weekend work

The transit authority is planning some major work this weekend that will close the Rhode Island Avenue and Brookland Metrorail stations. Free shuttle buses will replace trains between New York Avenue and Fort Totten.