During the peak afternoon arrival times, several jumbo aircraft arriving at once can cause backups.

This evacuation, however, led to many problems as it caused multi-hour backups on all freeways in Houston.

The evacuation caused backups at airports from coast to coast.

This arrangement causes large backups during weekday rush hours.

The protests, which in some areas caused 30-mile-long backups, were finished by the afternoon.

The clot would cause backups, until the body cried out in agony and exploded.

With that kind of spacing, a short delay causes immediate backups.

This causes significant backups before and after school and at special events.

Airport and stadium traffic could cause backups along this access route.

All other times it's barricaded, causing backups on the bridge and forcing traffic around a longer route.