to block a road, passage, entrance, etc. so that nothing can go along it, or to prevent something from happening correctly by putting difficulties in its way
The car broke down on the road and obstructed traffic for hours.
Protesters sought to obstruct the construction of the controversial project.
The fallen tree obstructed the path, requiring a detour for hikers.
It is illegal to intentionally obstruct emergency vehicles on the road.
Clear signage is essential to prevent drivers from accidentally obstructing entrances.
