If you like parades, this is good news. But if you're planning to drive on or across Constitution Avenue NW this morning, tomorrow morning or Monday morning, this is bad news.

Today, the National Firefighters Parade, sponsored by the D.C. Fire Department, will move down Constitution from Seventh to 17th streets NW starting at 10 a.m., with 79 units and lots of interesting historic vehicles.

Tomorrow, a Buddhist group (best known by its initials, NSA) will have a parade on the same route starting at 11 a.m. The Buddhists also will have a weekend of events on the Washington Monument grounds, with likely disruptions in traffic around the foot of 17th Street.

Monday, a Columbus Day parade will start after a wreath-laying at the Columbus statue in Union Station Plaza at 11 a.m. and will go by way of Louisiana Avenue and Constitution Avenue to the Ellipse. Italian-American groups will participate in the plaza ceremony, and there will be floats and bands, including the marching band of Robinson High School in Fairfax County.

Advice to Virginians driving downtown during parade hours on any of the three days: Use Memorial Bridge or the I-395 tunnel at the foot of Capitol Hill.