Travelers may encounter thunderstorms this afternoon, the Capital Weather Gang says. Then after that, it’s just hot for the rest of the week in the D.C. area. All the hot weather travel tips still apply. But you should find that rush-hour traffic is easing and there’s a little more breathing room aboard Metrorail as we get deeper into summer vacation season.

There are some new road projects starting this week, as well as some old favorites to watch.

Maine Avenue SW

The District Department of Transportation plans to start construction today to widen the trail and resurface the eastbound roadway along the south side of Maine Avenue SW between the northbound 14th Street Bridge ramp and 12th Street SW in the Waterfront neighborhood.

The project will replace the four-foot-wide sidewalk with a 14-foot-wide trail, as well as replacing the road surface, DDOT said.

Street parking in this area will be eliminated, and the number of traffic lanes will shrink from two to one. Some driveway entrances to businesses will be realigned.

Construction hours are 7 a.m. to 7 p.m. weekdays, and there also may be work on weekends between 8 a.m. and 5 p.m. The project is scheduled to be done by mid-October.

During construction, the sidewalk on the south side of Maine Avenue will be closed. Signs will detour pedestrians to the north side between 14th and Ninth streets. The fish market will be accessible only from the Ninth Street area. At least one vehicle lane will be kept open and access to all businesses on eastbound Maine Avenue will be maintained throughout the work, except during some temporary overnight closures.

Constitution Avenue

From 5:30 a.m. to 3:30 p.m. Monday through Friday, expect to find up to two lanes closed in each direction on Constitution Avenue NW between 23rd and 17th streets for the National Park Service reconstruction project. From 7 a.m. to 5 p.m. Saturday, expect to find up to three lanes closed in each direction.

Rock Creek Park

Wise Road NW in Rock Creek Park is scheduled to close between Beach Drive and Oregon Avenue on Tuesday and Wednesday from 9:30 a.m. to 2:30 p.m., which will probably result in traffic delays. The National Park Service said the closing is necessary to allow workers to work on the road and the nearby trees.

Clara Barton Parkway

DC Water continues to work on an odor abatement facility along the Clara Barton Parkway about three miles west of Chain Bridge. Watch for construction vehicles entering and exiting the parkway at the construction site, adjacent to the Little Falls pumping station. This work is scheduled to end next spring.

Beltway/Telegraph Road

These closings have been scheduled for the Wilson Bridge construction project in the Telegraph Road area.

Monday through Thursday, 9:30 a.m. to 3 p.m.: The ramps from northbound and southbound Telegraph Road to the Capital Beltway outer loop (I-95/495 North) will be closed.

Detour for northbound motorists: Turn right to eastbound Huntington Avenue to Route 1 North to the ramp to the outer loop. Detour for southbound motorists: Take the right-hand ramp to Huntington Avenue East to Route 1 North to the ramp to the outer loop.

Wednesday, 9:30 a.m. to 3 p.m., and Friday, 9 p.m. through Monday, Aug. 1, at 5 a.m.:

The exit ramp from the inner loop (I-95/495 South) to Telegraph Road South will be closed for roadway construction. Detour: Continue on the inner loop to Van Dorn Street to Franconia Road East to Telegraph Road.

Beltway/Silver Spring

Capital Beltway commuters should prepare to encounter a new work zone between Route 29 and Seminary Road in Silver Spring, where the state is about to start a resurfacing project.

Lane closings are scheduled to begin Saturday. But before that, drivers should watch for preparatory work, including the placement of project equipment and installation of temporary signs. The resurfacing is scheduled to be done by Thanksgiving.

New Hampshire Avenue

Two southbound lanes on New Hampshire Avenue south of Bonifant Road/Good Hope Road have shifted about 12 feet to the right, placing the traffic on the permanent alignment crossing the Intercounty Connector, which is under construction in that area. On Saturday, workers are scheduled to shift the northbound lanes about 24 feet to the left.

Anacostia Freeway

The District Department of Transportation is repairing the bridge over the Anacostia Park Entrance on the Anacostia Freeway (DC-295). Work is scheduled to continue through Sept. 20. The work hours are 7 a.m. to 4 p.m. and 8 p.m. to 5 a.m. Single lanes will be closed.

Route 29/Gallows Road

The Virginia Department of Transportation is ready to start rebuilding the congested intersection at Route 29 and Gallows Road in Merrifield. Night-time drivers will at times be funneled down to a single lane through the work zone. The project is scheduled to be done by the end of 2012.

A community meeting to discuss the project with VDOT officials is scheduled for 7 to 9 p.m. Wednesday at Luther Jackson Middle School, 3020 Gallows Rd., Falls Church.

I-66 meeting

The Virginia Department of Transportation will hold a public meeting this week to discuss its plan to create an active traffic management system along Interstate 66 between the Capital Beltway and Haymarket.

The project isn’t scheduled to be complete until 2014, and many decisions about how exactly it will work are yet to be made.

The meeting is scheduled for 5 to 8 p.m. Thursday at VDOT’s Northern Virginia District Office, at 4975 Alliance Dr. in Fairfax. A brief presentation will begin at 6 p.m.

Metro weekend work

The next major scheduled disruption in weekend train service is set for the first weekend in August, Aug. 6-7, when shuttle buses replace Red Line trains between Bethesda and Rockville.

On Aug. 7 only, buses will replace Blue and Yellow Line trains between Franconia-Springfield, Van Dorn Street and Eisenhower Avenue.