Today's read: Senators call for Metro investigation

They want federal probe of potential safety lapses. And Metro board Chairman Jim Graham said the transit agency's safety chief was "out of order" when she denied access to the monitors from the Tri-State Oversight Committee, who sought to ensure that Metro was following worker safety rules. (Lena H. Sun and Joe Stephens)

Walking in Washington. Cities that came of age in the post-World War II era, when the car was king, are far more dangerous places to walk than Washington, says a study by Transportation for America, an advocacy group. Boom areas including Orlando, Tampa-St. Petersburg, Houston, Atlanta, Las Vegas and Phoenix ranked among the 20 worst for walkers. Cities of the horse-and-buggy era are better places for traveling safely on foot. (Ashley Halsey III)