ADD this one to the “why?” category.

CBS is developing a remake of “The Streets of San Francisco,” the ’70s era ABC cop drama starring Michael Douglas and Karl Malden as Bay Area cops.

On the show, which aired from 1972-77, Malden played the older, wiser Det. Lt. Mike Stone, with Douglas – in his first major TV role – playing the younger, more rebellious Inspector Steve Keller.

The new show will keep the original title and will also be set in San Francisco.

“The times are very similar – it was the Vietnam War in the 1970s and the Iraq War now,” writer Stephen Turner told The Hollywood Reporter in rationalizing the “Streets” reincarnation.

“There is the same sort of tension between generations, and we wanted to carry that to the new series.”