Here are our picks for the top local stories to start your day:

Montgomery County officials unanimously approved a bill that would install traffic cameras on county school buses. (Photo by Jahi Chikwendiu/The Washington Post) (Jahi Chikwendiu/WASHINGTON POST)

Montgomery County school buses will be equipped with traffic cameras starting next school year. The county council approved a bill Tuesday that authorized the installation of the cameras, which will monitor whether cars behind the buses heed the stop signs that the buses display when students are boarding or disembarking.

Three Calvert County family members have died from similar respiratory illnesses, with a fourth currently hospitalized. Two died from flu complications, officials said.

A D.C. Council member is calling for food trucks to start paying sales tax. Food trucks don’t collect the 10 percent sales tax on food that the city requires for restaurants.

Coming up later today:

Didn’t get enough of Super Tuesday? Talk about it today: Eugene Robinson will chat live at 1 p.m. about last night’s results.

In Virginia’s General Assembly, Twitter has become part of the debate as more politicians use the social media platform to promote--or try to kill--legislation.

This week’s Free Range on Food chat, at noon, embraces Beer Madness, slow cookers and more.