Weeks after a high school shooting in Parkland, Fla., left 17 dead, students across the country walked out of school Wednesday morning to protest gun violence.

The walkout will likely impact roads surrounding scores of schools in the Washington, D.C. area as thousands of youths participate in the event, which began at 10 a.m.

Most area school districts have said they will allow students to participate in the walkout without punitive action. Loudoun County school officials have promised to discipline students who walk out of school; Fairfax County students can participate as long as they minimize disruption to class.

Motorists who normally expect relatively empty roads around school campuses in the mid-morning should expect crowds, TV camera crews and rallies across the area. Drive slowly, observe crosswalk areas and be wary of people darting across the street.