WASHINGTON — With the unofficial end of summer, comes new, longer rounds of Metro track work.

Here are three things to know this week:

1. 24/7 single-tracking on the Blue Line

With the final school systems returning to class after Labor Day, and the traditional end of summer, expect morning traffic on the roads to spike.

Commuters who decide to drive rather than use the Blue Line at Franconia-Springfield or Van Dorn Street Metro stations would add to delays.

During the week, the single-tracking significantly reduces the usual number of trains at Franconia-Springfield and reduces the number of rush-hour trains at Van Dorn Street. At Franconia-Springfield, trains are scheduled every 24 minutes at rush hour, and there are no Yellow Line “rush-plus” trains. Those Yellow Line trains are running to and from Huntington instead.

2. The work-arounds

Alternates include the Yellow Line from Huntington, VRE from Franconia-Springfield and special rush-hour express buses between Franconia-Springfield and the Pentagon.

Commuter buses or other service from park and ride lots may work better for some people.

Read more in the full track work guide for this surge.

3. What’s next

Next weekend, Sept. 10-11, Metro plans another complete shutdown in the area. Franconia-Springfield will be closed Saturday and Sunday. Separate single-tracking is scheduled to impact other lines.

The next work zone begins Sept. 15, with six weeks of weekday single-tracking on the Orange Line between Vienna and West Falls Church.

Metro will soon announce a revamped plan for further work zones. The changes were prompted by revelations about the breadth of failures in track inspections and new problems identified by federal investigators.