Striking university students blocked one of the most important roads in Belgrade for 24 hours. This footage illustrates a column of car drivers on the highway, passing under the blocked road, honking their horns in support of the blockade by students and citizens.

Serbia's striking university students on Monday launched a 24-hour blockade of a key traffic intersection in the capital, Belgrade, stepping up pressure on the populist authorities over a deadly canopy collapse in November that killed 15 people.